Mana Leak [Mystery Booster] 272 Whenever a player's pop

Whenever a player's pop

Set: HeartGold & SoulSilver: Base Set Type: Lightning Rarity: Uncommon Retreat cost: Colorless

Nightmare's power and toughness are each equal to the number of Swamps you control

Set: Commander Legends: Battle for Baldur's Gate Prerelease Promos Type: Legendary Creature — Tiefling Warrior Rarity: Rare Cost: {1}{U}{B}{R} Haste

Set: Mystery Booster Type: Enchantment Rarity: Rare Cost: {3}{B}{B} As Conspiracy enters the battlefield

Mana Leak [Mystery Booster] 272 Whenever a player's popSet: Mystery Booster Type: Instant Rarity: Common Cost: {1}{U} Counter target spell unless its controller pays {3}. The fatal flaw in every plan is the assumption that you know more than your enemy.