Great Celestial Emissary

Hexproof, Flying, Haste

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

Whenever you draw a card, put an Insight counter on it. It gets +1/+1 for each Insight counter on it. When it dies, create X 1/1 Celestial Emissary creature tokens, where X is the number of Insight counters on it.