Double strike
When Phyrexian Dragon Engine enters the battlefield from your graveyuard, you may discard your hand. If you do, draw three cards.
Unearth
(Melds with Mishra, Claimed by Gix.)
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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 and trample until end of turn.
* Creatures you don't control get -1/-1 until end of turn.
* Create two tapped Powerstone tokens.