Kiokahl, Evergreen Guardian

Flying, Defender
Kiokahl, Evergreen Guardian gets +0/+X and
can block X additional creatures.
Whenever Kiokahl blocks a creature, reveal the
top card of your library until you reveal an aura
that could enchant Kiokahl, and attach it to her.
Put the remaining revealed cards on the bottom
of your library in a random order. Shuffle the
aura into your library at the end of combat.