A few questions I feel like asking you:
1. If you take away the 'inflict plague' part, isn't this card basically a Momentum'd Forest Scorpion with weaker stats?
2. The 'causing poison to the opponent' is an active ability, and 'inflict plague' is passive, right?
3. This one isn't much of a question, but instead of "inflict plague to all the creatures", I believe the description should say "if this is killed, infect all the creatures of the killer".