Crabomination

Most emerge creatures ask you to sacrifice a spent creature to buy in cheap; this one changes the fuel line, letting an artifact go on the pyre instead and reducing the emerge cost by that artifact's mana value. The math is worth reading carefully: emerging costs , a mana more than the hard cast, so a mana-value-zero Treasure actually makes the creature more expensive, not less. The discount only turns positive once you feed it something worth two or more, which points the card toward a black artifact shell with real bodies to sacrifice: a spent Chromatic Star, a mid-value equipment, a dead mana rock. The enter trigger is the real hook. Instead of committing to one zone the way most black theft effects do, it raids three at once (the top of the opponent's library, a random card from their graveyard, a random card from their hand) and then offers a free cast from among them. The breadth is the point. Against a hellbent opponent the library card keeps the effect from whiffing; against a full grip the hand-strip doubles as disruption. Randomness is the honest tax on that reach: you gamble across what they happen to hold rather than surgically extracting the bomb, and the free-cast rider only pays when the roll lands on something you can actually resolve. Emerge has long pointed outward as much as inward, so the theft-plus-body shape is lineage; what this one adds is spread, a plundering rake across every zone backed by a 5/5 that turns the plunder into a clock.