Mana Sink

Cards that absorb huge mana pools and turn them into game-ending payoffs, typically through {X} spells or repeatable activated abilities scaling without bound. Walking Ballista pings for X repeatedly, Exsanguinate and Torment of Hailfire drain opponents proportional to X, Blue Sun's Zenith refills your hand, Fireball burns out the table, and Staff of Domination chains untap and draw activations. Helix Pinnacle stockpiles counters as a slow alternate win. Distinct from mana_combo.infinite_mana_piece, which generates the unlimited pool, and from mana_combo.mana_doubler and mana_combo.mana_untapper, which scale or recycle production; this is the spending end that converts that mana into a win.