Glacial Grasp

A tempo tapper with a refund clause, built to solve the oldest problem soft interaction has: spending a card to inconvenience one creature bleeds you out over a long game. The trailing draw fixes that, pulling the play back to card parity so the effect reads as smoothing rather than a losing trade. The untap-denial rider is where the real body of the card lives: freezing the creature through its controller's next untap step turns a one-turn stall into two full turns of freedom from an attacker or blocker. Because it is an instant, the tightest window is the beginning of combat step, before attackers are declared, when tapping an opponent's threat actually keeps it out of the swing; wait until attackers are on the board and you have only stranded a blocker for a turn. The two-card mill lands on whoever controls the tapped creature, so pointing it at an opposing threat chips their library, not yours; it is incidental to the tempo play, not a self-mill payoff, and it makes fueling your own graveyard awkward since you would have to freeze one of your own creatures to do it. Strip away the flavor and you are left with an unglamorous piece of blue interaction: it kills nothing, but it locks down a threat for long enough to matter and replaces itself on the way out.