Israfel, The 7th angel

Hexproof, First Strike, Gemini (When this
creature would die, Create 2 4/4
Avatar creature tokens with First strike.)
Avatar creatures gain First strike.
When Sachiel enter the battlefield,
place 1 Impact counter on each opponent.
(If your opponent has 15 Impact counters,
They lose the game. these counters cannot
be proliferated.)