Outwit

One blue mana buys a hard counter, but only against the narrow class of spells that target a player. Direct burn aimed at your face, hand-disruption like Mind Rot, edict effects that force a target player to sacrifice, the "target player draws" school of card advantage, even an Aura or curse cast at your face: these it stops cold. The line worth drawing is between spells that put a player on the stack as a target and spells that do not. Something that reads "each player draws two cards" never picks a target, so Outwit has no legal target and rots in hand; anything that names a target player hands it exactly the hook it needs. Creature removal, other counterspells, and anything aimed at a permanent or at nothing at all all sail past untouched. That single distinction is the whole gamble. This is the far end of the conditional-counter spectrum, past where Negate trades coverage for cost and Essence Scatter narrows to creatures: here whether the card functions at all depends on your opponent's spell selection rather than anything you can arrange in advance. The reward for shouldering that restriction is the price floor: a counterspell does not get cheaper than a single mana. It is a hate card wearing a control card's clothes, decisive against the spell it was tuned for and inert against the next one your opponent draws.