Assassin Gauntlet

The tempo swing bolted onto the enters trigger is what separates this from a plain looter-on-a-stick. Tapping down every creature an opponent controls the instant it hits the battlefield buys a clean attack step: your equipped threat swings into a board that cannot block, and the connect turns into card selection before their untap step ever comes. That single-turn opening is the whole reason to lead with the enters clause rather than banking the equip cost, because the tap effect fires once, on entry, and never again. What you keep afterward is modest by design: a +1/+1 bump and a loot-on-damage engine (draw a card, then discard one), the kind of steady digging that blue attackers have wanted since Curiosity taught the color to turn a connection into cards. The construction rewards a low, evasive body more than a big one, since the point is to guarantee the hit rather than to trade in combat. It reads as a build-around only until you notice the enters trigger does not require the Equipment to attach to anything, so even a stalled board still gets the alpha-strike window the turn it resolves. That flexibility (attach to up to one creature you control, tap the opponent's board regardless) is the quiet efficiency here, folding a one-sided tempo burst and a persistent card-filter into one artifact whose real cost is paid entirely up front.