Some Mutate Creatures

So for the set, the black and blue mutate creatures will be flavored as being afflicted with diseases, while the green and red mutate creatures will be the ones flavored as growing and reproducing out of control.

I've thought about some parasitic creatures and enchantments in black/blue that would allow for counters from creatures to be spent to cause effects, to sort of mechanically represent people studying and trying to use mutations for other ends. But I'm not entirely sure of the design space here, because I need to also make sure there's a decent number of friendly mutate triggers. You can't spend counters if it's too much trouble getting them in the first place. I'm still thinking about those drum enchantments. Now that I've changed spurn, they could still potentially work in the set. Not only can the by used for mutate triggers, your opponents use of the drum enchantments could trigger your own spurn abilities.