Susan Anders, Itsy Bitsy

When Susan Anders enters the battlefield, she enters with X +1/+1 counters on her, where X is the total life opponents have lost this turn.

Whenever one or more nontoken creatures an opponent controls die, put a +1/+1 counter on Susan Anders.

If damage would be dealt to Susan Anders while she has
one or more +1/+1 counters on her, prevent that damage,
and remove that many +1/+1 counters instead.

With great power comes great instability.