Serian of the Glint

: When Serian enters, exile X cards from the top of your library, then create X + 1 0/0 Fractal creature tokens. Put X + X +1/+1 counters on them.
+1: Your tokens become blue, black, red, and green, and gain flying until end of turn. Target creature gains haste until end of turn.
-3: Target player loses 3 life and you gain 3 life. You may sacrifice a creature. If you do, you gain 3 life. Exile Serian if it was cast this turn.