Choose a Space unit, a Ground unit, and a Character unit you control. At the end of your turn, if each of those units is in the arena it started in, you gain 8 Force.
This effect works even if a chosen unit leaves the arena and returns, and even if the card left play and returned to play in that arena. However, if it returned to play in the build zone or another arena and moved into the erena, the effect does not work.