Broken Concentration (SOI)

Instant

Counter target spell. Madness {3}{U} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Niche counterspell for madness and discard strategies, but it's significantly outclassed by efficient interaction like Counterspell and Spell Pierce in formats where it's legal. The madness cost is expensive enough that you're rarely happy casting it from hand, and the discard synergy it requires limits its home to very specific deck archetypes where the overhead justifies the slot.

Shadows over Innistrad — Uncommon