Helm of the Host [Dominaria] SWSH131 You can only Special Summon

You can only Special Summon "Black Dragon Collapserpent" once per turn this way

This card can make a number of attacks on monsters during each Battle Phase equal to the number of its materials +1

Set: Ghosts from the Past Card type: Continuous Trap Rarity: Ultra Rare Once per turn

Set: Magic Origins Type: Creature — Hydra Rarity: Rare Cost: {2}{G} Trample

until the end of this turn: negate the effects of all Spell and Trap Cards on your opponent's side of the field

Helm of the Host [Dominaria] SWSH131 You can only Special SummonSet: Dominaria Type: Legendary Artifact Equipment Rarity: Rare Cost: {4} At the beginning of combat on your turn, create a token that's a copy of equipped creature, except the token isn't legendary if equipped creature is legendary. That token gains haste. Equip {5} Forged out of flowstone for the queen of Vesuva.