I ran them for a while in place of plated, and if they added infect instead of poisonous they probably would have stayed. The poisonous doesn't scale with their damage so they might be a 4/4 but the opponent still only gets 1 poison counter if he gets hit so I found I could deal damage faster than I could stack poison. I switched to the plated because they added little more survivability off the start but I have been known to keep a playset handy, just in case.
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Thanks for the tip! I'll go about digging them up ;)