Eternity Snare

Six mana for a permanent freeze that does not actually freeze the creature on entry: the untap restriction only matters once the creature is already tapped, which means this is best aimed at attackers and mana dorks that volunteer to tap themselves, not at a static threat content to sit back and stare. The cantrip is the line item that justifies the slot. A single-target answer at this cost with no card behind it would simply lose you the exchange; drawing a card on entry pays back the tempo so the trade nets even rather than down. The lock is partial by design: the creature can still block, still carries any of its own enchant targets, and is removed from nothing but its own untap step, so the body remains a real object on the battlefield. That partial nature is also the weakness, because the restriction lives on the aura and not the creature. Any bounce, blink, or zone change strips the lock and returns a fully functional permanent to its owner. It belongs to a long line of blue "doesn't untap" effects that treat a tapped, locked creature as a substitute for killing it outright, a workaround for the color's longstanding reluctance to simply destroy a threat and have done with it.