Ertai's Trickery

Counterspells that only work against part of the metagame live or die on how much of the format their gate catches, and this one's gate is narrow on purpose: it stops nothing that wasn't paid for twice. Kicker, the mechanic that defined this card's home set, asks players to spend extra mana for a bigger effect, and this is the answer built explicitly to punish that decision. Against a base-cost spell it does nothing; against the same spell with its kicker paid, it's a single blue mana that voids the entire investment. That makes it a peculiar piece of design: a counter whose value is set not by what the opponent casts but by how greedy they got casting it. The flavor lines up cleanly with the function, since Ertai is the set's archetypal trickster mage, and the card's job is to turn an opponent's ambition into a tempo catastrophe. It was never meant for open play; it's a hate card aimed at one mechanic, and outside of an environment saturated with kicker spells the condition almost never comes up. As a study in conditional answers it's instructive precisely because the condition is so tight: the rate is absurd when it connects and irrelevant the rest of the time, which is the trade every narrow counter makes, just drawn here in its starkest form.