Multiplying Biophage

Parasite--This creature acts like an equipment,
except it is a creature and is not an artifact.
Attach {1}: Attach to target creature. Attached creature gains a -1/-1 counter at the beginning of
each player's upkeep. When attached creature
dies, create X tokens that are copies of
Multiplying Biophage, where X is the number of
-1/-1 counters that was on attached creature.
Sometimes the smallest lifeless are the most
dangerous.