Confidence:StrongSolidPlausibleTentativeSpeculative

• Delney, Streetwise Lookout

  2W

  Legendary Creature — Human ScoutW

  Delney, Streetwise Lookout makes Shire Shirriff's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Roaming Throne

  4

  Artifact Creature — GolemC

  Roaming Throne makes Shire Shirriff's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Callidus Assassin

  4UB

  Creature — Human Shapeshifter AssassinBU

  One-shot copy enabler: a card enters as a copy of another (Phantasmal Image, Body Double, Phyrexian Metamorph), firing the partner's substantive ETB once. Not a repeating chain — fires once on entry — but valuable when the partner's ETB is combo-grade (graveyard reanimator, mana doubler, etc.).
• Rionya, Fire Dancer

  3RR

  Legendary Creature — Human WizardR

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Mirror Room // Fractured Realm

  2U5UU

  Enchantment — Room // Enchantment — RoomU

  Mirror Room makes Shire Shirriff's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Helm of the Host

  4

  Legendary Artifact — EquipmentC

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Kiki-Jiki, Mirror Breaker

  2RRR

  Legendary Creature — Goblin ShamanR

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Saheeli, the Sun's Brilliance

  UR

  Legendary Creature — Human ArtificerRU

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• The Jolly Balloon Man

  1RW

  Legendary Creature — Human ClownRW

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Reg Barclay, Fidgety Fantasist

  2UR

  Legendary Creature — Human ArtificerRU

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Wizard's Staff

  1U

  Artifact — EquipmentU

  Wizard's Staff makes Shire Shirriff's triggered ability trigger an additional time — each time it fires, you get it twice. Value, not a loop.
• Tempestra, Dame of Games

  1R

  Legendary Creature — Elemental IllusionR

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Dino DNA

  1

  ArtifactC

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Felhide Spiritbinder

  3R

  Creature — Minotaur ShamanR

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Feldon of the Third Path

  1RR

  Legendary Creature — Human ArtificerR

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Gray and Adira, Forever Joined

  2U/RU/R

  Legendary Creature — Trill Human OfficerRU

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Orthion, Hero of Lavabrink

  3R

  Legendary Creature — Human SoldierR

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Splinter Twin

  2RR

  Enchantment — AuraR

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Jaxis, the Troublemaker

  3R

  Legendary Creature — Human WarriorR

  Copy engine: one card makes copies of a creature — once a turn, or once for each time you pay its cost — and each copy pays off: the creature's enter-the-battlefield effect fires again, or the hasty copy uses its tap ability. Real, repeatable value — every copy has its turn or its price, so it never goes infinite on its own.
• Sheoldred, Whispering One

  5BB

  Legendary Creature — Phyrexian PraetorB

  Sheoldred, Whispering One returns creatures from the graveyard to the battlefield, re-firing Shire Shirriff's enter-the-battlefield effect.
• Springheart Nantuko

  1G

  Enchantment Creature — Insect MonkG

  Springheart Nantuko creates token copies, feeding Shire Shirriff's ETB or copy payoff.
• The Soul Stone

  1B

  Legendary Artifact — Infinity StoneB

  The Soul Stone returns creatures from the graveyard to the battlefield, re-firing Shire Shirriff's enter-the-battlefield effect.
• Glyph of Reincarnation

  G

  InstantG

  Glyph of Reincarnation returns creatures from the graveyard to the battlefield, re-firing Shire Shirriff's enter-the-battlefield effect.
• Virtue of Persistence // Locthwain Scorn

  5BB1B

  Enchantment // Sorcery — AdventureB

  Virtue of Persistence returns creatures from the graveyard to the battlefield, re-firing Shire Shirriff's enter-the-battlefield effect.
• Asmodeus the Archfiend

  4BB

  Legendary Creature — Devil GodB

  Asmodeus the Archfiend bounces a permanent, enabling Shire Shirriff's recast / spell-cast trigger.