Tidehollow Sculler

The whole disruption package of Thoughtseize stapled to a body, with a catch that defines how it plays: the exile is conditional, not permanent. Strip a nonland card from the opponent's hand on entry, but the moment this dies, gets bounced, or otherwise leaves the battlefield, the prize goes right back. That return trigger is the fulcrum the card balances on. It turns a clean two-power attacker into a delayed liability: every removal spell the opponent draws is also a way to reclaim what you took, and a well-timed bounce of their own can hand back a key spell at the worst possible moment. The card also hides one of Magic's classic stack tricks: respond to your own enter trigger by sacrificing the Sculler, and the leave-the-battlefield trigger resolves first against an empty exile zone (returning nothing), so when the enter trigger then resolves you still choose and exile a card, but with no Sculler left to ever give it back. Flickering it does the opposite work, re-triggering the steal for a fresh card while the prior exile snaps back to hand. As an artifact creature it slots into more graveyard and tribal shells than its color identity alone would suggest, but the design idea is what carried it through years of two-color tempo and disruption: hand attack that costs you nothing in cards and asks for nothing back, so long as you keep the body on the table. The discipline is in protecting it; the moment you stop, the disruption unwinds.