Everyone has a Price

{3}: Choose target creature. Starting with you,
each player may pay any amount of mana. Repeat
this process until no one pays mana. The player
that pays the most mana gains control of that
creature. If tied, the owner of that creature gains
control of it. Any player may activate this ability,
only during their upkeep.
Whenever a player gains control of a creature
they don't own, create a Treasure token for that
creatures owner.