Nightsister Possession

Card Text

When the battle phase starts, if each player has a unit with total build cost 6 or less in any arena, each player may choose another player's unit with total build cost 6 or less in any arena. If a player does, and that player pays X+2 Force, where X is the chosen unit's total build cost, that player gains control of the chosen unit until the battle phase ends unless the other player pays X+4 Force.