Prodigal Pyromancerutility$0.16A repeatable creature-based damage source that can ping any target, giving similar utility as a mana sink. It is cheaper to activate but deals less damage each time.
Thermo-Alchemistutility$0.24Functions as a repeatable damage engine from a small red creature slot. It rewards spellcasting rather than a large mana activation, but fills a similar role of steady direct damage.
Firebreathingutility$0.85Classic red mana sink that turns excess mana into increased combat damage. It is less direct than Flamewave Invoker but serves the same late-game 'spend lots of mana for damage' role.
Keldon Megalithsutility$0.39A land-based repeatable source of damage that can finish players or planeswalkers. It is slower but very similar in being a colorless mana sink for repeated burn.
Squee, Dubious Monarchutility$0.32Provides a recurring red threat that can keep converting board presence into damage. It is not direct burn, but it plays a similar aggressive role in red decks with recursive value.
Kumano, Master Yamabushiutility$0.35A repeatable red source of damage with a mana-activated ability, similar to Flamewave Invoker's sustained burn plan. It costs more to cast but offers stronger long-term control and reach.
Chandra, Torch of Defiancefinisher$2.87A red planeswalker that turns loyalty and mana into direct damage and board pressure. It fills a similar finisher role by repeatedly converting resources into reach.
Shard Phoenixutility$0.81A red creature that provides repeated board impact and pressure over time. It is less focused on player/planeswalker burn, but it serves as a resilient red threat with recurring value.