When Aria of Flame enters the battlefield, each opponent gains 10 life.

Whenever you cast an instant or sorcery spell, put a verse counter on Aria of Flame, then it deals damage equal to the number of verse counters on it to target player or planeswalker.

This spell costs {X} less to cast, where X is the total amount of noncombat damage dealt to your opponents this turn.

Trample

Whenever a source you control deals noncombat damage to an opponent, Chandra's Incinerator deals that much damage to target creature or planeswalker that player controls.

At the beginning of each player's end step, Citadel of Pain deals X damage to that player, where X is the number of untapped lands they control.

Demonfire deals X damage to any target. If a creature dealt damage this way would die this turn, exile it instead.

Hellbent -- If you have no cards in hand, this spell can't be countered and the damage can't be prevented.

Enchant creature

Enchanted creature has "{R}, {T}: Copy target instant or sorcery spell you control. You may choose new targets for the copy."

When Fiery Inscription enters the battlefield, the Ring tempts you.

Whenever you cast an instant or sorcery spell, Fiery Inscription deals 2 damage to each opponent.

Whenever you cast a noncreature spell, Firebrand Archer deals 1 damage to each opponent.

When a spell you control deals damage, transform Flame Channeler.

Whenever a spell you control deals damage, put a flame counter on Embodiment of Flame.

{1}, Remove a flame counter from Embodiment of Flame: Exile the top card of your library. You may play that card this turn.

+2: Search your library for a basic Mountain card, reveal it, put it into your hand, then shuffle.

-3: Koth, Fire of Resistance deals damage to target creature equal to the number of Mountains you control.

-7: You get an emblem with "Whenever a Mountain enters the battlefield under your control, this emblem deals 4 damage to any target."

Whenever a player taps a land for mana, if it's not that player's turn, destroy that land.

Red spells you cast cost {1} less to cast.

Whenever a player casts a spell, Spellshock deals 2 damage to that player.

If a red source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 2 instead.

First strike

Whenever you cast an instant or sorcery spell, Urabrask deals 1 damage to target opponent. Add {R}.

{R}: Exile Urabrask, then return it to the battlefield transformed under its owner's control. Activate only as a sorcery and only if you've cast three or more instant and/or sorcery spells this turn.

(As this Saga enters and after your draw step, add a lore counter.)

I -- The Great Work deals 3 damage to target opponent and each creature they control.

II -- Create three Treasure tokens.

III -- Until end of turn, you may cast instant and sorcery spells from any graveyard. If a spell cast this way would be put into a graveyard, exile it instead. Exile The Great Work, then return it to the battlefield (front face up).

Whenever a land enters the battlefield, Zo-Zu the Punisher deals 2 damage to that land's controller.