They're nonland permanent cards that also have spells within them that can be cast first
Looking at one of the games purest colors: White
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It especially benefits from Cromat's ability that returns it to the top of the deck, since when mutated all cards are considered one, making you not lose value, leaving your resources safe with the ability to return everyone to your deck in front of a removal With access to five colors it is easy to choose the best from the list of creatures with this ability, such as Nethroi, Apex of Death and make your Cromat invincible
This set of 4 features a reprint in Aetherize, which is a decent card but nothing too fancy
Now beat all the other people in the park and talk to them after the duel