Phyrexian Dreadnought [Mirage] Imp there is an additional combat

there is an additional combat phase followed by an additional main phase

Set: Revised Edition Type: Land — Swamp Forest Rarity: Rare ({T}: Add {B} or {G}

Set: Ice Age Type: Enchantment Rarity: Rare Cost: {B}{B}{B} Skip your draw step

Set: Tenth Edition Type: Creature — Zombie Rarity: Rare Cost: {1}{B}{B} Other Zombie creatures get +1/+1

Set: Magic 2012 Type: Creature — Vedalken Wizard Rarity: Rare Cost: {1}{U}{U} {U}

Phyrexian Dreadnought [Mirage] Imp there is an additional combatSet: Mirage 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.