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Both Forcefields will try to apply. You’ll need to choose one, which would reduce the damage, making the other Forcefield no longer apply to the scenario.
You would attack, check if all characters are tapped. If they are tapped, untap them, then end the turn. At that point, you may Combine.
There is currently no maximum number of cards allowed in your Battle Deck.
EDIT: You must resolve Leap of Faith and the second card you flip from Leap of Faith, then Field Communicator’s ability and Wheeljack’s ability can be resolved in an order of your choosing.
In order to play the second Drill Arms, you first scrap the one that’s already in play. This immediately becomes the only card in your deck, so when you use the ability of the new Drill Arms, that’s the card you’ll draw.
You stop flipping and immediately regret holding onto so many cards.
1. Yes, when you flip a character in your turn, you can flip a character on the battlefield or in your KO area.
2. Abilities only function in the KO area if they specifically say so. Most abilities, like Ransack’s, do not function in the KO area.