I think this card is currently solid, but may end up becoming a build-around card, in a deck with a bunch of other Rush cards
You have a campaign that has a deep Dota lore behind it
You can use them honestly, like Modern Hammertime, have a few silver bullets like Skullclamp in a tokens deck, or brew up a combo strategy that breaks Worldslayer
Cards with dredge 4 or greater like Golgari Thug, Stinkweed Imp and Golgari Grave-Troll are always worth considering
Mega Evolution adds a whole extra layer of fun to the Charizard hype, giving us X and Y-themed forms to collect in Flashfire
Although the 2 for 1 can empty your hand rather quickly, formats like Legacy and Vintage are literally build on cards like Force of Will and would be absolutely unplayable without it