There are three of these effects available, presented here as a way to make the deck go into turbo
With the Champion of Stray Souls i have a nice matchwinner
As for Random Encounter specifically, I love the idea of bringing in a creature like HecteyesHecteyes, TonberryTonberry, or CactuarCactuar onto the battlefield, like it was an actual video game
Talking about Whelming Wave why not double down and put a Cyclonic Rift in there aswell
Artifact Mutation and Aura Mutation play in the space created by Carrion, although in this case they create creature tokens for you while destroying your opponent's artifacts and enchantments, respectively
Battle your friends with armies of adorable critters and prove that bravery comes in all sizes