Automated Artificer

{T}: Add {C}. Spend this mana only to activate an ability or cast an artifact spell.

Myr Scrapling

Sacrifice Myr Scrapling: Put a +1/+1 counter on target creature.

Ashling the Pilgrim

{1}{R}: Put a +1/+1 counter on Ashling the Pilgrim. If this is the third time this ability has resolved this turn, remove all +1/+1 counters from Ashling the Pilgrim, and it deals that much damage to each creature and each player.

Lavabrink Floodgates

{T}: Add {R}{R}.
At the beginning of each player's upkeep, that player may put a doom counter on Lavabrink Floodgates or remove a doom counter from it. Then if it has three or more doom counters on it, sacrifice Lavabrink Floodgates. When you do, it deals 6 damage to each creature.

Mountain

Kozilek's Channeler

Rumbling Rockslide

Rumbling Rockslide deals damage to target creature equal to the number of lands you control.

Wild Ricochet

You may choose new targets for target instant or sorcery spell. Then copy that spell. You may choose new targets for the copy.

Banefire

Banefire deals X damage to any target.
If X is 5 or more, this spell can't be countered and the damage can't be prevented.

Seismic Strike

Seismic Strike deals damage to target creature equal to the number of Mountains you control.

Demolish

Victorious Destruction

Destroy target artifact or land. Its controller loses 1 life.

Spectral Searchlight

{T}: Choose a player. That player adds one mana of any color they choose.

Explosive Entry

Destroy up to one target artifact. Put a +1/+1 counter on up to one target creature.

Vessel of Volatility

{1}{R}, Sacrifice Vessel of Volatility: Add {R}{R}{R}{R}.

Unstable Obelisk

{T}: Add {C}.
{7}, {T}, Sacrifice Unstable Obelisk: Destroy target permanent.

Blaze

Call In a Professional

Players can't gain life this turn. Damage can't be prevented this turn. Call In a Professional deals 3 damage to any target. (Shield counters don't prevent this damage as they're removed.)

Fire Diamond

Fire Diamond enters tapped.
{T}: Add {R}.

Manalith

Carnelian Orb of Dragonkind

{T}: Add {R}. If that mana is spent on a Dragon creature spell, it gains haste until end of turn.

Tail Slash

Target creature you control deals damage equal to its power to target creature you don't control.

Volcanic Geyser

Volcanic Geyser deals X damage to any target.

Temple of the False God

{T}: Add {C}{C}. Activate only if you control five or more lands.

Loreseeker's Stone

{3}, {T}: Draw three cards. This ability costs {1} more to activate for each card in your hand.

Vandalize

Choose one or both —
• Destroy target artifact.
• Destroy target land.

Spell Satchel

Magecraft — Whenever you cast or copy an instant or sorcery spell, put a book counter on Spell Satchel.
{T}, Remove a book counter from Spell Satchel: Add {C}.
{3}, {T}, Remove three book counters from Spell Satchel: Draw a card.

Unforge

Destroy target Equipment. If that Equipment was attached to a creature, Unforge deals 2 damage to that creature.

Staff of the Flame Magus

Whenever you cast a red spell or a Mountain you control enters, you gain 1 life.

Blinding Flare

Strive — This spell costs {R} more to cast for each target beyond the first.
Any number of target creatures can't block this turn.

Shatter

Consulate Skygate

Defender
Reach (This creature can block creatures with flying.)

Jaws of Stone

Jaws of Stone deals X damage divided as you choose among any number of targets, where X is the number of Mountains you control as you cast this spell.

Rack and Ruin

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.

Hedron Crawler

{T}: Add {C}. ({C} represents colorless mana.)

Burnished Hart

{3}, Sacrifice Burnished Hart: Search your library for up to two basic land cards, put them onto the battlefield tapped, then shuffle.

Vial of Poison

{1}, Sacrifice Vial of Poison: Target creature gains deathtouch until end of turn. (Any amount of damage it deals to a creature is enough to destroy it.)

Gilded Lotus

Wayfarer's Bauble

{2}, {T}, Sacrifice Wayfarer's Bauble: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Tanglebloom

Furnace of Rath

If a source would deal damage to a permanent or player, it deals double that damage to that permanent or player instead.