For example, a green Rhino that lives near mountains might have a special ability that makes all red creatures (say, your Sedge Trolls, Orc Conscripts, Firefright Mages, etc.) more powerfulwhich would work nicely if you were playing with a deck of green and red
Birthing Pod Good enough to spawn an entire archetype named after it, several pod commanders, and 25 different Wish.com versions, Birthing Pod spawned, er, birthed a whole subset of decks focused on working up a chain of creatures
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A large number of serialized Multiverse Legends held onto their value as well, featuring dozens of cards priced at over $100
My favourite play with this is getting out Borrelsword while Meizen is on the field and since Iron Digger makes the equipped monster a ninja you can attack directly with Meizen and then after activating Borrelsword, attack two more times for game
It allows you to also get a shrine, so its a 4-mana card that tutors two cards