Good rare options include the power 9, cards from the reserved list (proxied, of course), or cards that are banned in certain formats
However, with updated rules, regenerate became a shield you activated pre-emptively to prevent a creature from being destroyed in the future
How does this one work
Straight up removal, like Hero's Downfall, burn to the face that slides over to smash ol Gids, and then ummm, maybe creatures
It is lower life overall and significantly lower right away
Although the introduction of the Double Dragon Energy card has somehow remedied this inconvenience, decks still require giving up space to make place for energy cards, which could have been better filled with useful Trainers or pokmon