Arahbo, Roar of the World [Commander 2017] Limited Edition Alpha when a Spell/Trap Card is

when a Spell/Trap Card is activated: You can negate the activation

When you do: Target 1 Spell Card in your Graveyard

and enchantment with converted mana cost X or less

" —Mencius

Arahbo, Roar of the World [Commander 2017] Limited Edition Alpha when a Spell/Trap Card isSet: Commander 2017 Type: Legendary Creature Cat Avatar Rarity: Mythic Cost: {3}{G}{W} Eminence At the beginning of combat on your turn, if Arahbo, Roar of the World is in the command zone or on the battlefield, another target Cat you control gets +3 +3 until end of turn. Whenever another Cat you control attacks, you may pay {1}{G}{W}. If you do, it gains trample and gets +X +X until end of turn, where X is its power.