Quote from Melkor »Anybody have any advice for these damn prowess decks? they're just so fast. I'm rusty, getting back after a long time of mostly commander and it just feels like a bad time to keep having these solid hands but i'm dead before it matters
Trinisphere is a beating out of the Karn, the Great Creator wishboard that slows Prowess's spellcasting to a crawl or even stops it entirely, and maindeck Thragtusk often comes down and gains life just early enough to matter (unlike Wurmcoil Engine). One of the most successful MTGO lists lately runs Wandering Archaic to hopefully either stifle their spellcasting rate or copy a burn spell and zap one of their dudes. I suspect that using Nature's Claim in the sideboard might give you enough life gain against Prowess.