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{Go Solo} (Pay this Legend's cost to play it as a ready Unit. It can attack this turn. If it leaves the field, remove it from the game.) {Play} Defeat a rival Unit.
No, the [PLAY] effect only activates when you play Adam Smasher to the field area.
Yes. [GO SOLO] plays Adam Smasher to the field area and triggers the [PLAY] effect.
Yes.
Yes.