Laccolith Warrior
The Laccolith cycle from Nemesis ran one mechanic across five creatures, and this is the version stapled to a clean fighter's body. The trick lives entirely in the block step: when an opponent commits a blocker, the Laccolith may redirect its full power to any creature on the battlefield, then steps out of the combat math entirely by dealing none of its own damage that turn. That is a deliberate trade, and the design discipline is in the timing window. The redirection only fires on being blocked, so an opponent who simply takes the hit denies you the effect; the decision to spring the trigger belongs to whoever chooses whether to block. The target, though, is yours: the controller picks any creature on the board, so the opponent's block doesn't aim the burst, it merely arms it. What you are really wielding is a removal threat an opponent must walk into, which warps how they assign blockers more than the raw 3/3 line ever does. The whole Laccolith family worked this way, scaling the redirected damage to each creature's power, the conceit being that the rock formations channeled their force outward rather than crashing through. As a piece of design it reads as a quiet ancestor of the "deals damage equal to its power to a creature it fights" template Magic standardized much later: the Laccoliths got there first by routing the effect through the block trigger, letting the opponent supply the occasion while the controller still calls the shot.
