Ivy's Bat Trap

Wither

Whenever a creature with a -1/-1 counter on it dies,
put a number of +1/+1 counters on Ivy's Bat Trap
equal to the number of -1/-1 counters on
that creature.

When Ivy's Bat Trap dies create X 0/1 green Plant
creature tokens where X is the number of counters
on Ivy's Bat Trap.