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I had an idea for a new style of "EX" type card we could make. What about Pokemon Fusion? Where it's two Pokemon combined. Pic related.
They would count as two types at once, and they would be supremely powerful - the catch being that you need to get both of their forms in play - in this example case, both Beedrill and Pidgeot - stage 2 cards.
But here's the kicker - when you play the Pokemon Fusion, you remove all damage counters from the Pokemon required for the fusion, then attach all Energy cards attached to them to the Pokemon Fusion. Then you place all the other cards in the lost zone.
So basically it allows you to set it up before it gets into play and also heals all damage and is super powerful. On the flip side, like EX, the opponent takes two prizes for them.
You might say "Well 2 Stage 2 is a lot of work" but they would be balanced to be worth the effort it takes to get them into play.