Maybe I do have something
HP Boosting cards like this one are most often useful when they can push a Pokmon out of the range of being knocked out in a single hit, but forcing a knockout to take an additional turn can often be a boost to a deck in need of the improved prize trade
If Cursed Wombat leaves the battlefield while a spell or ability that would put one or more +1/+1 counters on one or more permanents you control is still on the stack, those permanents won't have the additional ability granted by Cursed Wombat when those counters would be put on those permanents, so that additional ability won't trigger
Nothing else about them is relevant for now except for the fact that the other side of them, as theyre an MDFC, is Tibalt, Cosmic Impostor
But both are playable in ways you might not normally care about
Darkness-type Pokmon tend to have attacks that make your opponent discard cards