Marchesa's Smuggler

The unblockable rider is the payload here, not the 1/1 carrying it. Paying the two-color activation makes any creature you control connect this combat and connect immediately, since the haste half means the target can swing even if it just arrived under your control this turn. That combination reads as filler until you point it at something whose combat damage does real work: a commander's on-hit trigger, a saboteur effect, an attack you cannot afford to have chumped. The Smuggler is an enabler wearing the costume of an aggressive Rogue, and its own dethrone counter (a nod to the shifting-life-leader politics of a multiplayer table) is incidental to the plan. Activate it twice in a turn and two threats slip through; activate it at the right moment and you delete the single variable a defensive player was counting on, the block. The ceiling belongs entirely to whatever the unblockable creature does when it lands, which makes this the kind of open-ended tool that looks like an afterthought and becomes a reliable win condition the instant a genuine payoff sits behind it.