Skyseer's Chariot

Vehicles usually earn their keep by attacking: a crewed body that dodges sorcery-speed sweepers when it's back to being an artifact. This one folds a targeted hate effect into the frame instead, taxing the activated abilities of a chosen card name by two mana the moment it enters. That naming clause is the interesting part. Most stax and tax pieces in white are blunt (they hit whole card types or all activated abilities across the board); this one is a scalpel. You point it at the single engine you're most afraid of, the mana rock powering the opposing chain, the planeswalker-adjacent activated ability, the recursive graveyard loop, and you make every source with that name pay a toll. The tradeoff is obvious: it only slows one name, so it demands you read the table and know which lever the opposing deck is actually pulling. Get the read wrong and you've named a card that never mattered. Get it right and a 3/3 flier that costs is quietly draining the tempo out of somebody's payoff every time they want to use it. It's a design that asks for a decision the card doesn't make for you, wrapped in a body that still crews up and flies over for pressure while the tax does its slow work.