Containment

Card Text

Add 1 counter    Tap one of your opponent's units. Play only if you have a Location in that unit's arena and only during your build step.

Remove 1 counter    Chooise a Location in play. Treat the chosen Location as if it has a printed build cost of 0 until end of turn.

Remove 4 counters    Choose an arena. Your opponent's units can't move to or from the chosen arena and can't retreat from the chosen arena until end of turn.