Zedri, Mortician Matriarch

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.)
Whenever Zedri, Mortician Matriarch or another nontoken creature you control dies, Learn. This ability triggers only once each turn.
Whenever you discard a creature card, put a -1/-1 counter on target creature.