Confidence:StrongSolidPlausibleTentativeSpeculative

• Kiki-Jiki, Mirror Breaker✓

  2RRR

  Legendary Creature — Goblin ShamanR

  Copy chain: one card creates hasty copies of a creature whose ability or ETB the partner exploits — the canonical Kiki-Jiki / Splinter Twin pattern.
• Splinter Twin✓

  2RR

  Enchantment — AuraR

  Copy chain: one card creates hasty copies of a creature whose ability or ETB the partner exploits — the canonical Kiki-Jiki / Splinter Twin pattern.
• Saheeli, the Sun's Brilliance

  UR

  Legendary Creature — Human ArtificerRU

  Paid copy loop: one card makes copies of a creature, and each copy readies the copier to copy again — but a copy or the untap costs mana every time. It runs for as long as you can pay: a mana sink, infinite only with infinite mana.
• The Jolly Balloon Man

  1RW

  Legendary Creature — Human ClownRW

  Paid copy loop: one card makes copies of a creature, and each copy readies the copier to copy again — but a copy or the untap costs mana every time. It runs for as long as you can pay: a mana sink, infinite only with infinite mana.
• Feldon of the Third Path

  1RR

  Legendary Creature — Human ArtificerR

  Paid copy loop: one card makes copies of a creature, and each copy readies the copier to copy again — but a copy or the untap costs mana every time. It runs for as long as you can pay: a mana sink, infinite only with infinite mana.
• Orthion, Hero of Lavabrink

  3R

  Legendary Creature — Human SoldierR

  Paid copy loop: one card makes copies of a creature, and each copy readies the copier to copy again — but a copy or the untap costs mana every time. It runs for as long as you can pay: a mana sink, infinite only with infinite mana.
• Elrond, Moon-Reader

  2U

  Legendary Creature — Elf NobleU

  Teardrop Kami has activated abilities that aren't mana abilities, fueling Elrond, Moon-Reader's activation-trigger.
• Illusionist's Bracers

  2

  Artifact — EquipmentC

  Teardrop Kami has activated abilities that aren't mana abilities, fueling Illusionist's Bracers's activation-trigger.
• Rings of Brighthearth

  3

  ArtifactC

  Teardrop Kami has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.