Slimebind

The clever half of combat trickery lives in the -X/-0 clause, and here it is stripped to its purest defensive form: no toughness reduction, no card advantage, just a declaration that four points of an attacker's power will not connect. Flash carries the whole design. Held up until attackers are declared or blockers matter, it turns a would-be threat into a body that swings for almost nothing, or blanks the offense of a prospective blocker before your own swing. The permanent nature supplies the tension: unlike a one-shot trick, the -4/-0 sticks, so a big attacker becomes a small attacker indefinitely rather than for a single turn. The trade for that low cost is that it never actually kills anything; it leaves toughness untouched, does nothing against a body already small enough to attack profitably, and cannot out-trade evasion. Blue has long owned this corner of the pie (the -X/-0 shrink, the aura that neutralizes rather than destroys), and this pares the instinct down to a single dependable number, priced so the caster keeps mana open through the turn. What it buys is time and favorable combat math, applied permanently to whichever creature currently threatens the most damage.