What would this do if you put it on your own Vanadium Warden? Would it be able to use its ability without being delayed itself (allowing it to both activate and still attack if buffed) or would it become unable to use its ability at all?
It's a fairly narrow card in use, but in the right matchup it could be pretty good. I think I'd reduce the costs by 1 on both versions because of that. It would also have synergy with things like Basilisk Blood + Otyugh + this to avoid the 6 turn delay.