Lynkin, The Bright Reaper

Deathtouch, Indestructible, Vigilance

Whenever a creature enters or leaves a graveyard Lynkin deals damage equal to that creatures toughness to any target.

{2}{r}{b}{t}- Until end of turn all creatures you control have base power and toughness 4/4 and become Wraith Ravens with Flying but retain all other abilities.

{w}{w}{b}{b}- Lynkin gains Swampwalk and Flying
until end of turn.