Confidence:StrongSolidPlausibleTentativeSpeculative

• Reanimate

  B

  SorceryB

  Reanimate puts Grotag Siege-Runner onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Helping Hand

  W

  SorceryW

  Helping Hand puts Grotag Siege-Runner onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Unearth

  B

  SorceryB

  Unearth puts Grotag Siege-Runner onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Grave Researcher // Reanimate

  2BB

  Creature — Troll Warlock // SorceryB

  Grave Researcher puts Grotag Siege-Runner onto the battlefield from a graveyard without casting it, so its mana cost is never paid.
• Elrond, Moon-Reader

  2U

  Legendary Creature — Elf NobleU

  Grotag Siege-Runner has activated abilities that aren't mana abilities, fueling Elrond, Moon-Reader's activation-trigger.
• Marina Vendrell's Grimoire

  5U

  Legendary Artifact — BookU

  Grotag Siege-Runner produces broad damage that redirects through Marina Vendrell's Grimoire into something useful.
• Lich's Mastery

  3BBB

  Legendary EnchantmentB

  Grotag Siege-Runner produces broad damage that redirects through Lich's Mastery into something useful.
• Vilis, Broker of Blood

  5BBB

  Legendary Creature — DemonB

  Grotag Siege-Runner produces broad damage that redirects through Vilis, Broker of Blood into something useful.
• Oath of Lim-Dûl

  3B

  EnchantmentB

  Grotag Siege-Runner produces broad damage that redirects through Oath of Lim-Dûl into something useful.
• Illusionist's Bracers

  2

  Artifact — EquipmentC

  Grotag Siege-Runner has activated abilities that aren't mana abilities, fueling Illusionist's Bracers's activation-trigger.
• Vengeful Warchief

  4B

  Creature — Orc WarriorB

  Grotag Siege-Runner produces broad damage that redirects through Vengeful Warchief into something useful.
• Rings of Brighthearth

  3

  ArtifactC

  Grotag Siege-Runner has activated abilities that aren't mana abilities, fueling Rings of Brighthearth's activation-trigger.
• Transcendence

  3WWW

  EnchantmentW

  Grotag Siege-Runner produces broad damage that redirects through Transcendence into something useful.
• Lich's Tomb

  4

  ArtifactC

  Grotag Siege-Runner produces broad damage that redirects through Lich's Tomb into something useful.