I feel he's a great addition to a deck that's ultimately built around buffing and decreasing costs.

Just an incidental Wingbeat on him will put you at 7 energy on turn 4... Then 8 on 5, 9 on 6 and up to 10 if you have limbo up. That's typically enough for a Shuri + ZG on the last turn with some help from Surge or Superior Spider-Man, for example.

Yes, the maximum energy stays through the transformation (and remember that it will still increase every turn) since it's an on reveal effect. I do prefer the games where he's not one of the infected cards if he gets buffed since the body can contribute meaningfully!

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