Great Celestial Emissary

Hexproof, Flying, Islandwalk

Blue spells you cast cost {1}{u} less to cast.

Whenever you draw a card, put a +1/+1 counter
on this card. When this card dies, create X 1/1 Celestial Emissary creature tokens, where X is
the number of +1/+1 counters on this card