Charismatic Conqueror
Every artifact or creature an opponent plays untapped becomes a fork with two bad tines: tap it down and lose the tempo, or leave it up and hand over a lifelinking Vampire. The "may tap" clause is doing the load-bearing work, because it makes the drawback the opponent's decision rather than a coin flip, which means they always pick the outcome that hurts them least and still get taxed for it. What it punishes is precisely the stuff that usually feels free: a mana rock resolving ready to fuel a spell, a flash blocker landing at end of step, a fresh creature entering set to swing back next turn. Note the scope: lands, enchantments, and planeswalkers slip through untouched, so the tax lands hardest on artifact-heavy and creature-heavy plans. It squeezes two opposite failure modes at once, taxing the opponent who leaves interaction up and the one who floods the board with untapped bodies, and it does the squeezing while attacking, since the vigilant body keeps swinging even as it polices. That two-front pressure is the thing a plain lord or a plain stax piece cannot replicate; it plays closest to a Suppression Field that, when its enforcement is ignored, pays you an army of lifelinkers instead of merely charging a fee.
