Unsubstantiate

The trick here is one sentence covering two entirely separate jobs, chosen by where you point it. Aimed at the stack, it works as a soft answer that does not counter so much as delay, sending the spell back to its caster's hand and forcing them to recommit the mana on a later turn. Aimed at a creature on the battlefield, it becomes a tempo bounce that resets enters-the-battlefield triggers and clears a blocker or an attacker. Both halves trade your two mana against the opponent's full investment, and the math swings entirely on the target: bounce a five- or six-cost spell and you have stolen an enormous chunk of their turn, while bouncing something cheap is a wash at best. The catch is that it never replaces itself. Unlike a draw-on-bounce effect, it heads to your graveyard while their card returns to hand, so in raw card count you are down one; the payoff has to come from tempo, not economy. That is why this kind of effect belongs in tempo shells rather than control ones: it wants a clock already ticking, so the turn it steals actually matters, and against a recast it only buys time rather than winning the exchange outright. The unrestricted target line (any spell, any creature, no color or type gate) is the whole appeal: one slot answers a problem permanent or protects a key turn from interaction, without committing to either role until the moment arrives.