Mekhet, The Eldest

Flying, Annihilator 3, haste
When Mekhet, The Eldest enters the battlefield. No other creature can attack or block this turn
Whenever an opponent sacrifices a nontoken permanent, flip that card and attach it to Mekhet. Mekhet gains +2/+2 for every card attached to it.
"Tonight I'm the Tzimisce clan and all will be part of me."
-Mekhet, The Eldest.