There have been hero cards before that help generate a resource for their heroes. These resource generators usually generate a wild resource, which is very nice. This upgrade flips the script on that sort of thing as this card being on the board turns all of Hulkling's hero cards into 1 ER, the card itself. Every single one of Hulkling's hero cards is 2 resources or less except for this one. Once it is on the board, you never want it to leave. Even if you have to discard an upgrade, it is inherently better to discard a Shapeshift Upgrade since you can get it back in alter ego form and pay for it with this card. If you somehow should manage to go a hand without a single Hulkling card, well, you at least get that extra resource to pay for your cards.

I would say that this card is worth using your mulligan to go and try find since you automatically get to pull a Shapeshift with Teddy Altman's ability. You can win games without this ever hitting the board but I would say that Hulkling games go much smoother with this in play.