Whenever you attack, each opponent loses X life and you gain X life, where X is the number of attacking creatures. If Mishra, Claimed by Gix and a creature named Phyrexian Dragon Engine are attacking, and you both own and control them, exile them, then meld them into Mishra, Lost to Phyrexia. It enters the battlefield tapped and attacking.

Whenever Mishra, Lost to Phyrexia enters the battlefield or attacks, choose three — • Target opponent discards two cards. • Mishra deals 3 damage to any target. • Destroy target artifact or planeswalker. • Creatures you control gain menace (This creature can't be blocked except by two or more creatures.) and trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) until end of turn. • Creatures you don't control get -1/-1 until end of turn. • Create two tapped Powerstone tokens (A Powerstone is an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.").