To fix this, we just included them as one slot
Kristoff Mining the Ruins can repeat the trick every turn as long as he has a card under him
Creature tokens are the most common case, but nowadays we have lots of token types, including Treasure tokens, role tokens, Food tokens, Blood tokens the list goes on
If you want to take it even further you can use closet de-humidity packs, or buy a dehumidifier
(Woo, obscure Dark Souls reference, I'm totally hip to the times) Instead of the usual counterattack strategy, MetalGarurumon seems fixated on blowing shit up
However, the card collecting community seems to desire "out of the pack" condition of cards and any damage that happens to them along the way should remain on the card