I'm using a Freaks deck right now, and I've noticed in Arcade and in some pvp that in stead of doing 2 damage per round, the poison is only doing 1 damage per round - is it a glitch, or something I don't know?!?
If you have ability animations on, it will tell you why. If it's off, then my best guess would be that either the opponent dropped to 3 lives or that the opponent had a heal card like Malicia, Mina, etc.
No freaks poison is perfect as it is really the min 3 keeps the hole clan from being op.
an you have to play attention to what your cards say the min is when it stops working.
if they heal tho your poison will kick back in