A Black Mask

Equipped creature gains deathtouch, first strike, vigilance, and +10/+10
At the beginning of your upkeep flip a coin. If you win the coin flip keep control of the equipped creature and it gains and extra +10/+10 until the beginning of your next turn. If you fail the coin flip, give an opponent control of the equipped creature until the end of their turn. This effect can only apply once per turn order.