Mesmerizing Dose

The don't-untap Aura lock is an old blue trick, but bolting a proliferate trigger onto the enter-the-battlefield tap grafts a set mechanic onto a template that never asked for it. That graft is the whole tension. Because it enchants a creature, the proliferate resolves looking outward: poison counters ticking toward ten on an opponent, energy or charge counters you have been banking, a saga inching toward its final chapter, +1/+1 counters on your own attackers. In a deck with nothing to proliferate the trigger still resolves cleanly and just does nothing, and the card collapses into an overcosted lock that freezes a blocker and stays until someone breaks the enchantment. The double identity is where it stops being a plain tapper. As removal it neutralizes a threat and holds indefinitely, the proliferate an idle bonus. As an enabler it earns its slot in a counters-matter shell, where the lockdown is nearly incidental and the enter-the-battlefield trigger is the reason it is here at all. The card rarely pays for both jobs in the same game, so it asks which one you actually need before it justifies the mana and the card slot. Where the answer is only "tap a creature," the price is too steep; where the answer is "advance my counters and, incidentally, freeze something," the two halves finally pull in the same direction.