Converge — Kaleidoscorch deals X damage to any target, where X is the number of colors of mana spent to cast this spell.

Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Gates Ablaze deals X damage to each creature, where X is the number of Gates you control.

Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.

Paradox — Impending Flux deals X damage to each opponent and each creature they control, where X is 1 plus the number of spells you've cast from anywhere other than your hand this turn.

Foretell (During your turn, you may pay and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Thunder Salvo deals X damage to target creature, where X is 2 plus the number of other spells you've cast this turn.

Whenever you cast a multicolored spell, this enchantment deals X damage to any target, where X is the number of colors that spell is.

Choose a color. Searing Rays deals damage to each player equal to the number of creatures of that color that player controls.

Firespout deals 3 damage to each creature without flying if was spent to cast this spell and 3 damage to each creature with flying if was spent to cast this spell. (Do both if was spent.)

Welding Sparks deals X damage to target creature, where X is 3 plus the number of artifacts you control.

As an additional cost to cast this spell, discard X cards.

Nahiri's Wrath deals damage equal to the total mana value of the discarded cards to each of up to X target creatures and/or planeswalkers.

Calamitous Cave-In deals X damage to each creature and each planeswalker, where X is the number of Caves you control plus the number of Cave cards in your graveyard.

Cataclysmic Prospecting deals X damage to each creature. For each mana from a Desert spent to cast this spell, create a tapped Treasure token.

Thunder of Hooves deals X damage to each creature without flying and each player, where X is the number of Beasts on the battlefield.

Tundra Fumarole deals 4 damage to target creature or planeswalker. Add for each spent to cast this spell. Until end of turn, you don't lose this mana as steps and phases end. ( is mana from a snow source.)

Judgment Bolt deals 5 damage to target creature and X damage to that creature's controller, where X is the number of Equipment you control.

Discard a card at random. If you do, Kindle the Carnage deals damage equal to that card's mana value to each creature. You may repeat this process any number of times.

Reach

Whenever you cast a spell with mana value 4 or greater, this creature deals 2 damage to each opponent.

Whenever you cast a noncreature spell, this creature deals 1 damage to each opponent.