Vampires are my jam, along with Merfolk
Problems usually happen when proxies are used to mislead people or when someone tries to bring them into spaces that require authentic cards
In the worst case, if they never break out in Standard, cards like Merfolk Mistbinder and Legion Lieutenant will always have casual demand to support their price
Mizzium Skin allows you to pump a creature's toughness by 1 and give it hexproof for 1 mana
By using creatures to tap for mana, trigger draws and generate bonus tokens (also elves), the elfball can multiply in size at dizzying speeds
My one reservation about printing more cards like this is that they can be incredibly selfish with the chess clock if you take multiple long turns without winning, so just be self-aware enough to not bore your friends, and make sure you include win conditions