Accepting the Mantle

Assist

Accepting the Mantle enters the battlefield
with one plus X time counters. If another player assisted paying for the cost of
Accepting the Mantle, double the amount of time counters on Accepting the Mantle. When there are no more time counters on Accepting the Mantle, you win the game.

You cannot play Accepting the Mantle unless you control a Tal'Set and a Tarkeen.