Briber's Purse enters the battlefield with X gem counters on it. {1}, {T}, Remove a gem counter from Briber's Purse: Target creature can't attack or block this turn.
2014-09-20
Activating the ability targeting a creature that's already attacking or blocking won't remove it from combat or affect that attack or block.
2014-09-20
If Briber's Purse has no gem counters on it, it remains on the battlefield, although you can't activate its last ability.