Gasalval, Duskborn Paladin

Deathtouch, Vigilence
Gasalval enters the battlefield with Dusk Counters equel to X.
Pay three Dusk Counters: Tap target creature, that creature does not untap on its untap phase unless its controller declares it can, if they do, put a -1/-1 counter on it. Put one -1/-1 counter on it each turn until the player declares it tapped again.
{t}{r}{b}{b}, You gain one Dusk Counter.