Gauntlet of Might

Red creatures get +1/+1.
Whenever a Mountain is tapped for mana, its controller adds an additional {R}.

Chain Lightning

Chain Lightning deals 3 damage to any target. Then that player or that permanent's controller may pay {R}{R}. If the player does, they may copy this spell and may choose a new target for that copy.

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Nevinyrral's Disk

Nevinyrral's Disk enters tapped.
{1}, {T}: Destroy all artifacts, creatures, and enchantments.

Rukh Egg

When Rukh Egg dies, create a 4/4 red Bird creature token with flying at the beginning of the next end step.

Regrowth

Return target card from your graveyard to your hand.

Pyrotechnics

Pyrotechnics deals 4 damage divided as you choose among any number of targets.

Taiga

Detonate

Destroy target artifact with mana value X. It can't be regenerated. Detonate deals X damage to that artifact's controller.

Demonic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Shatter

Ball Lightning

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Haste (This creature can attack and {T} as soon as it comes under your control.)
At the beginning of the end step, sacrifice Ball Lightning.

Sylvan Library

At the beginning of your draw step, you may draw two additional cards. If you do, choose two cards in your hand drawn this turn. For each of those cards, pay 4 life or put the card on top of your library.

Sol Ring

Mox Emerald

Volcanic Island

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Fork

Copy target instant or sorcery spell, except that the copy is red. You may choose new targets for the copy.

Mox Sapphire

Time Walk

Shatterstorm

Destroy all artifacts. They can't be regenerated.

Ancestral Recall

Badlands

Earthquake

Earthquake deals X damage to each creature without flying and each player.

Mountain

Mox Jet

Blood Moon

Red Elemental Blast

Choose one —
• Counter target blue spell.
• Destroy target blue permanent.