Orochimaru, Immortal Sanin

Snake creatures you control gain +1/+1
{1}{w/b}: Target creature you control gains Undying until the end of this turn.
{2}{b/g}: Exile target creature from target player's graveyard, Orochimaru Immortal Sanin gains the abilities of all creatures exiled this way.
{3}{g/w}: Create a 1/1 green snake creature token with deathtouch, then populate.