Elon Rotten Branch

Partner with Slithas Poison Fang (When this creature enters the battlefield, target player may put Slithas into their hand from their library, then shuffle.)
Forestwalk, swampwalk
Dragons your team controls have forestwalk and swampwalk (They can't be blocked as long as defending player controls a Forest or a Swamp.)
"Once I served The Green Wings. Now the wings i serve, are black."