Emberknife

Emberknife enters the battlefield with 3
challenge counters.
Enchanted creature gets +1/+1 if blocked by a
token creature created by a legendary artifact.
Every time you cast a spell targeting a token
creature remove a challenge counter.
If Emberknife doesn't have a challenge
counter on it at the end of
your turn, create a 1/1 green saproling
creature token.
Equip {3}