Zombie Master [International Collectors’ Edition] Gym Heroes Unlimited Activated abilities of sources with

Activated abilities of sources with the chosen name can't be activated unless they're mana abilities

Set: Legends Type: Enchantment — Aura Rarity: Rare Cost: {W}{W}{W} Enchant creature

Set: Limited Edition Alpha Type: Enchantment — Aura Rarity: Rare Cost: {B}{B} Enchant artifact

then put a number of +1/+1 counters on Yule Ooze equal to that permanent's converted mana cost

Set: Champs and States Type: Creature — Human Knight Rarity: Rare Cost: {R}{R} First strike

Zombie Master [International Collectors’ Edition] Gym Heroes Unlimited Activated abilities of sources withSet: International Collectors Edition Type: Creature Zombie Rarity: Rare Cost: {1}{B}{B} Other Zombie creatures have swampwalk. (They can't be blocked as long as defending player controls a Swamp.) Other Zombies have "{B}: Regenerate this permanent." They say the Zombie Master controlled these foul creatures even before his own death, but now that he is one of them, nothing can make them betray him.