Decalan the Ringmaster

Menace, Haste, Trample

When Decalan or another Non-token creature enters
the battlefield, create a 3/3 Human Mercenary with "whenever this creature dies, create a treasure token"

Whenever a creature an opponent controls dies, you
may pay {3}. If you do, create a token copy of that creature under your control. For each mana spent
with a treasure, create a copy of that token.