Rakdos Ringleader

The discard is what this Skeleton is really selling, and the body is built to make you earn it. A single point of toughness means a chump block or any incidental ping ends the assault, but the regeneration shield converts many removal spells into a tax instead of a kill, and first strike lets it survive ground stalls its toughness has no right to win. Connect, and the opponent discards at random; keep it connecting, and that becomes a slow strangle on their hand, one card per turn while the rest of the board grinds to a stalemate. This is the black-red attrition beater in distilled form: the three damage on top matters far less than the resource gap opening underneath, where each swing both empties an opposing hand and survives the answer meant to stop it. The brittle frame is what balances the whole package. A sturdier creature stapled to recurring random discard and regeneration would be miserable to face, so the cost lands in both the steep six-mana rate and the 3/1 itself, a stat line so fragile it folds to almost anything that touches it. That fragility is precisely why the regeneration ability exists: it is the only thing standing between the discard engine and the first removal spell or favorable block the opponent draws.