Damage Engine

Permanents that turn a recurring event into damage to every opponent: Purphoros, God of the Forge and Impact Tremors on creatures entering, Guttersnipe and Firespitter Whelp on spells cast, Hazoret the Fervent on activation, Judith, Carnage Connoisseur on a modal spell-cast trigger, Dáin of the Ancient Halls on attacking, Aang, Master of Elements on each upkeep. The group-slug and Torbran, Thane of Red Fell decks stack these so every trigger hits the whole table. Distinct from Burn, the one-shot instant or sorcery, from Pinger, which aims activated damage at one target, from Drain, which is life loss paired with your lifegain, and from ETB Damage, the one-shot damage a permanent deals when it itself enters. Symmetric sources that also hit you (Manabarbs, Sulfuric Vortex) are not included.