Hag, Catalyst of Hexes

Whenever an opponent casts a noncreature spell,
Hag, Catalyst of Hexes deals damage equal to its power to that player.

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

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"A curse is upon you. It will cause your ruin."