Dubo, Mercenary Merchant

You have protection from permanents you own.
{t}: Choose another creature you control.
Starting in turn order, each opponent may bid
an amount of life that has not already been bid.
The player who bids the highest amount then
loses that much life and gains control of the
creature. If the creature changes controllers, you
create X Treasure tokens, where X is the
converted mana cost of the creature plus
the highest bid.