Does it only activate after the entire team has been KOed (in point matches you lose 2 points and then the whole team is revived)?
Will it activate if you only have 1 battle koma (character in the deck)?
No, and no. It's only useful in point battles, and even then, you'd be better suited having something that helps your character stay alive in the first place. --- "Freddie Mercury is a sex machiiiiiine ready to relooooooad, like an atom bomb, he's about to wooooahhh wooooahhhh wooooahhhh EXPLODE." - bluerain