Shadowverse

To bait out all the removals and evasions, you'll need to spend twenty turns throwing random spells just to annoy the opponent. By that time, you'll have enough time to deal one hit with some forgotten fairy or even a top-decked cockroach. On the arena, however, with a 95% probability, the anomaly will be a killing blow, but the elf on the arena is just weak and I suspect the situation won't change much.
You need very strong control to push the anomaly through to the opponent's face, and I'm not sure it's worth it, and it might be easier to use other win conditions. I would have already started crafting clowns and bolts if it weren't for Roland's amulet and the strength test – judging by the text, it affects not only followers but also spells. As I wrote before, I think that clown + Rosie is a more reliable win condition than the anomaly. If other forest dwellers come to the same conclusions, I predict a pixie paradise in the meta.
Also, I'm very worried that the warden will turn out to be much worse than we imagine. With so many counters to storms and wardens, it will probably be slightly better than Zeus and maybe even better than Albert (who comes out a round earlier), but it might still not be good enough.