Flying, skulk, deathtouch

Emerge {5}{U}{B}{B} (You may cast this spell by sacrificing a creature and paying the emerge cost reduced by that creature’s mana value.)

Devour 1 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that many +1/+1 counters on it.)

When you cast Plagued Death Dragon, each opponent sacrifices a creature they control with greatest power among creatures they control unless they lose life equal to the total mana value among creatures they control.