Culling Hydra

Trample
Hydra and Treefolk creatures enters the battlefield with 4 -1/-1 counters.
Whenever a Hydra or Treefolk deals damage to a creature, remove that many -1/-1 counters from it and put them onto that creature. If a nontoken creature dies this way, put a token that's a copy of that creature except its a Hydra Head and gains Culling Hydra's abilities.