Gauntlet of Might [Collectors' Edition] Copy target activated or triggered ability you control. You may choose new targets for the copy. but it is necessary

but it is necessary

Set: Murders at Karlov Manor Prerelease Promos Type: Creature — Vampire Assassin Rarity: Mythic Cost: {3}{B}{B}{B} Flying

Set: Mystery Booster 2 Type: Sorcery Rarity: Mythic Cost: {4}{U}{U} Each player shuffles their hand and graveyard into their library

you may copy that ability

{T}: Gain control of target legendary permanent

Gauntlet of Might [Collectors' Edition] Copy target activated or triggered ability you control. You may choose new targets for the copy. but it is necessarySet: Collectors' Edition Type: Artifact Rarity: Rare Cost: {4} Red creatures get +1 +1. Whenever a Mountain is tapped for mana, its controller adds an additional {R}.