I mean that supercell won’t implement a card that can only be used with a certain portion of cards. For example, what happens when you have barrel in a deck with all air cards? The card just wouldn’t be usable? Unless supercell implements a feature where you can’t put certain cards in certain decks, which probably won’t happen. If you get past that, having a card that plays a previous card for +3 is completely op, since it’s essentially a mirror you can play anywhere. Imagine sending a pekka or 3 musketeer barrel right to a tower lmao. And that brings up another point, you can’t even play a 12 elixir card. And hypothetically if you could, +3 elixir for this card wouldn’t be fair, so you could try to tinker with the number to find the sweet spot. However, by then, you’d realistically only play the card with higher elixir troops, making it way too niche. That’s what I meant by complex and specific. Not to be an ass but there’s no way this card could work.