Shalash The Herald

Indestructible
{w}{w}{w}{b}{b}{b}: Shalash gains the toughness,
power, abilities and modifiers of target non-land permanent until the end of turn.
Oathpact (When Shalash is removed from the battlefield, exile target creature and shuffle Shalash
into your library. Next time Shalash comes into
play, bring exiled creature back into the battlefield.)