Phyrexian Dreadnought [Judge Gift Cards 2010] Elder Dinosaur if you cast it

if you cast it

instead each opponent sacrifices half the creatures they control

Set: Invasion Type: Instant Rarity: Rare Cost: {2}{U} Change the text of target spell or permanent by replacing all instances of one color word with another or one basic land type with another until end of turn

Set: Alpha Edition Type: Enchantment — Aura Rarity: Rare Cost: {W} Enchant Wall

If you would be free

Phyrexian Dreadnought [Judge Gift Cards 2010] Elder Dinosaur if you cast itSet: Judge Gift Cards 2010 Type: Artifact Creature Phyrexian Dreadnought Rarity: Rare Cost: {1} Trample When Phyrexian Dreadnought enters the battlefield, sacrifice it unless you sacrifice any number of creatures with total power 12 or greater.