Diregraf Colossus [Shadows over Innistrad Prerelease Promos] Pokémon Rumble return target artifact card with

return target artifact card with mana value less than or equal to the amount of life you gained this turn from your graveyard to the battlefield tapped

Noncreature spells with {X} in their mana costs can't be cast

Karametra isn't a creature

000 Type: Artifact Creature — Human Soldier Rarity: Uncommon Cost: {2}{U} Flash

Diregraf Colossus [Shadows over Innistrad Prerelease Promos] Pokémon Rumble return target artifact card withSet: Shadows over Innistrad Prerelease Promos Type: Creature Zombie Giant Rarity: Rare Cost: {2}{B} Diregraf Colossus enters the battlefield with a +1 +1 counter on it for each Zombie card in your graveyard. Whenever you cast a Zombie spell, create a tapped 2 2 black Zombie creature token.