Bladeback Sliver

Hellbent is the mechanic that pays you for emptying your hand, and grafting it onto a Sliver anthem is a deliberately strange fit: Slivers are a go-wide, keep-drawing-fresh-threats tribe, while Hellbent asks you to run yourself dry. The reward for that tension is a board-wide reach engine. Every Sliver you control becomes a tap-to-ping machine aimed at players and planeswalkers, turning a stalled or emptied hand into a slow drain that closes games from outside combat. That reach matters against decks that can hold the ground but not the air of a dozen simultaneous pings. The catch is the one baked into Hellbent itself: the moment you draw a card or hold up an answer, the whole engine switches off, so the payoff runs directly against the instinct to keep resources in hand. It rewards the empty-handed all-in that Slivers, being a creature-flood tribe, tend to reach naturally by the mid-game. The tribal grant is the important half of the design: this is not one creature that pings, it is a battlefield full of them acquiring the ability at once, which is the kind of scaling only a tribe with an anthem-and-copy history can exploit. A modest body doing quiet work while a resource condition, not a mana cost, gates the real power.