Declaration in Stone), that isn't Gorgons.
Blue has it, Red has it.
How does this goes with your claim that green and white can prevent counters on creatures?
It's not the same if you take damage and heal and if you prevent damage. If you prevent damage from death toucher is not 95% the same as if you add +0/+X to creature...
They did. Because, -1/-1 like +1/+1 counters are evergreen and available in all colors.
Just because you get life gain (black, green and white). Doesn't mean you get prevent damage (white, green). Bottom line there is a finer granularity to giving colors ability than just + and - negate themselves to be prevention 0. Sure it sometimes works. But it's not really a rule.
Source.From the Comprehensive Rules (October 4, 2019—Throne of Eldraine)
704.5u In a Two-Headed Giant game, if a team has fifteen or more poison counters, that team loses the game. See rule 810, “Two-Headed Giant Variant.”
If you cast on a creature, creature becomes a land and it falls off, since it's "enchant a creature" aura is enchanting a land. Alternatively, it could be "Enchant creature or basic land (your opponent controls)", to make it pointless as ramp.
Will one tick of more permanent damage going to matter much more than one tick of healable damage?
I like that one corruption counter is essentially whatever. It feels flavorfull that you would accept that one tick of corruption. I mean, what's the big deal. One poison is much more harsh. But then you get like a ton of them, and it suddenly is much more painful.
I quite like the Infected Cutthroat. It seems balanced for both corruption as damage and generic corruption. Same with Scorching Lacetator.
Pox Drone is interesting. I could see even doing some kind of mini proliferate "If you do, choose a kind of counter on that player and give them an additional one of that kind", it would probably be blue though.
Foul Cur. Not too great fan of a Rootwalla abilities, myself. They are kind of hard to keep track off.
I do like Spreading Infection really much.
Here is one of colored cards that used in my causes corruption in white.
Inquisitorial Purge - 4W
Exile target creature or artifact. Its controller gains a corruption counter.