Anivia, Guardian of the Land

Flying
Anivia's toughness is equal to your devotion to
blue.
{u}{u}:Put a -1/-1 counter on target
creature. You may tap or untap that creature.
When Anivia, Guardian of the Land dies, create a
0/1 blue Egg creature token with defender and
"Sacrifice Egg: Return Anivia, Guardian of
the Land from the graveyard into your hand."