Reap Intellect

Reap Intellect lives almost exclusively in Commander, where games go long enough to cast it for a meaningful X, and where targeting a single player's key piece — a combo enabler, a commander recursion target — can effectively remove them from the game. In Legacy and Vintage, it's legal but thoroughly unplayable: faster answers like Thoughtseize and Surgical Extraction do the same job for a fraction of the mana, and the sorcery speed means you'll never deploy it at the right moment. Modern and Pioneer offer the same problem — the format clock is too fast for a variable-cost sorcery that does nothing until turn five or six. Stick to Commander, where Reap Intellect's full exile clause is a genuine threat.