The Hunter's Guild

{t}: Add {w},{u},{b},{r}, or {g}
{2}: Put a bounty counter on target non-human creature. The next time a creature would die, for
each bounty counter on that creature, create a treasure token. (It's an artifact with "Tap, Sacrifice
this artifact: Add one mana of any color.")
Any player may activate this ability.
The Hunter's Guild can be your commander.