Mergo, Blackmarket Merchant

At the beginning of your second main phase
reveal your hand. Bid (Each player may cast spells
from among the revealed cards by paying mana
of any color. If casting of the same spell
from different players occur, they must bid off
more mana than the other player to cast it).
If a player casts a spell you own, create treasure
tokens equal to the spells converted mana cost.
Players can use {p/b} to cast spells you own.