Mei, Freeze Master

When Mei enters, create a 0/4 blue Wall creature token with Defender and "When this enters, draw a card".

Cryo-freeze - {u}{u},{t}: Exile Mei, and return it to play under its owner's control at beginning of the next end step.

Blizzard - {2}{u}{u}, {t}: Tap up to 2 target creatures. Put a stun counter on all tapped creatures target opponent controls.