Calista, the Black Wolf

Deathtouch, vigilance, first strike, haste

Calista, the Black Wolf can't attack its owner and
can't be sacrificed.

At the beginning of each combat, starting with you,
each player may pay {1}. Repeat this process until
no player pays. The player that paid the most mana
gains control of Calista the end of combat. If an
opponent paid the most, Calista's owner creates that
many Treasure tokens.