Queen Marchesa [Commander Masters] Modern Classic Set: Arena League 2004 Type:

Set: Arena League 2004 Type: Basic Land — Plains Rarity: Rare ({T}: Add {W}

Set: Zendikar Rising Prerelease Promos Type: Creature — Angel Cleric Rarity: Mythic Cost: {3}{W}{W} Flying

Each creature you control with defender assigns combat damage equal to its toughness rather than its power and can attack as though it didn't have defender

or if it's just a special card for MagicCon Philadelphia

Queen Marchesa [Commander Masters] Modern Classic Set: Arena League 2004 Type:Set: Commander Masters Type: Legendary Creature Human Assassin Rarity: Rare Cost: {1}{R}{W}{B} Deathtouch, haste When Queen Marchesa enters the battlefield, you become the monarch. At the beginning of your upkeep, if an opponent is the monarch, create a 1 1 black Assassin creature token with deathtouch and haste.