Gray Merchant of Asphodel [Mystery Booster] SPA Centelleo Whenever you cast a spell

Whenever you cast a spell that targets Gnarlback Rhino

by definition

Some zombies are natural-reborn leaders

Set: Oath of the Gatewatch Type: Sorcery Common Cost: {4}{R} Surge {1}{R} (You may cast this spell for its surge cost if you or a teammate has cast another spell this turn

Gray Merchant of Asphodel [Mystery Booster] SPA Centelleo Whenever you cast a spellSet: Mystery Booster Type: Creature Zombie Rarity: Common Cost: {3}{B}{B} When Gray Merchant of Asphodel enters the battlefield, each opponent loses X life, where X is your devotion to black. You gain life equal to the life lost this way. (Each {B} in the mana costs of permanents you control counts toward your devotion to black.)