Queen Chellrey of Sheora

Whenever a creature enters the battlefield under
an opponent's control, reveal a number of cards
from the top of your library equal to that
creature's mana value. You may put a creature
card revealed this way into your hand. Put the
rest of the cards on the bottom of your library in
a random order.
Whenever you cast a creature spell, creatures you control get +1/+1 until end of turn.