Since I always liked Rod of Ruin for some reason, I figured I could mirror it properly for our aztec theme. The part that is interesting is that you can also use this thing on yourself if you fancy getting poisoned a little

Rod of Venom
4
Artifact
3, T, Add one poison counter to target player.
I'll leave the flavor text up to more creative individuals

Another option for this is to turn it into some equipment a creature could pick up, but I'm not sure that's the right approach. In any case, can I tone down the CC, or at least the Activation Cost? Also, should I word it as 'Add one poison counter', or should it be 'Give one poison counter' ?
Thoughts, Suggestions?