I think it is a fair card for green to have given the ubiquity of good counterspells in Modern
Thalia jams the breaks on any player attempting to combo off using storm cards
Set Number 44 Language Legal Formats Commander, Historic, Legacy, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Modern, Pauper, Pioneer, Standard, Timeless Rulings (6/6/2025) The ability is not a mana ability
The starting life clause is the whole point: This black board wipe gets turned on very easily in Commander once somebodys been smacked around, although it may be too slow to be useful as a speed bump against aggro decks in the early game
The layout is also not especially smooth for fast, one-handed phone use
And thats about where the good stuff ends, because Peters main ability, Youre Next!, is useless unless you are playing against a pirate deck