Erebus is more efficient than condor with aflatoxin. It seems like a possibly OP OTK. You might need to specify that it doesn't stack.
Otherwise, I think they are interesting.
Because it's really easy to let Malignant Cells set up.
It isn't. Trust me.
And yes, it does stack. Just good luck getting enough up to make it count.
I am considering nerfing Erebus' damage.
^Yes... sadly malignant cells just take too long to set up to make vulture - toxin - plague truly powerful... Very fun to see a 23|24 vulture though.
... Adrenaline helps, but that takes an extra element to work... and willingness to pop adrenaline on an enemy creature. Thats pretty risky. You have to have a bit of death wish there, or at least a dangerous streak.
I'm not as experienced as some at PvP, but I do know it can backfire vs AI... and if the AI can cope with it, odds are that players won't have a major issue.
I don't think theres any major risk for abuse atm. If anything that combo would be slightly UP.
The best use I see is as a counter to kitty... unfortunately, the poor cat really doesn't need the nerf IMHO.
Its a fun support card concept though.