This land enters tapped unless you control a Mountain. {T}: Add {R}. {R}, {T}, Exert this land: Add {R}{R}. If that mana is spent on a creature spell, it gains haste until end of turn. (An exerted permanent won't untap during your next untap step.)

{T}, Pay 1 life, Sacrifice this land: Search your library for a Mountain or Plains card, put it onto the battlefield, then shuffle.

This land enters tapped unless you control a Mountain. {T}: Add {R}. {1}{R}{R}, {T}: Creatures you control get +1/+0 until end of turn.

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle. Then if you control four or more lands, untap that land.

{T}: Add {C}. {2}, {T}: Each player draws a card, then discards a card.

{T}: Untap target attacking creature. Prevent all combat damage that would be dealt to and dealt by that creature this turn.

{T}: Add {C}. {2}, {T}: Each player draws a card.

({T}: Add {R}.)

This land enters tapped. {T}: Add {C}. {2}, {T}, Sacrifice this land: Search your library for up to two basic land cards that share a land type, put them onto the battlefield tapped, then shuffle.

{T}, Pay 1 life, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield, then shuffle.

As Three Tree City enters, choose a creature type. {T}: Add {C}. {2}, {T}: Choose a color. Add an amount of mana of that color equal to the number of creatures you control of the chosen type.

{T}: Add one mana of any color in your commander's color identity.

Whenever you discard a card, exile that card from your graveyard. {2}, {T}: Draw a card, then discard a card. {4}, {T}, Sacrifice this artifact: Return all cards exiled with this artifact to their owner's hand.

{2}, {T}, Sacrifice this artifact: Search your library for a land card, reveal it, put it into your hand, then shuffle.

Whenever an opponent discards a card, you may draw a card.

Equipped creature has haste and shroud. (It can't be the target of spells or abilities.) Equip {0}

{T}: Add {C}. {1}, {T}, Sacrifice this artifact: Draw a card.

Whenever you discard a card, choose one that hasn't been chosen this turn — • Draw a card. • Create a Treasure token. • Each opponent loses 3 life.

{T}: Put a charge counter on this artifact. {T}: Each player draws a card for each charge counter on this artifact.

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

{T}: Add {C}{C}.

{T}: Each player draws a card.

Your opponents can't gain life. −2: Create a 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target."

Trample, haste Alliance — Whenever another creature you control enters, double this creature's power until end of turn.

Flying Whenever this creature deals combat damage to a player, each player discards their hand, then draws seven cards.

Haste Whenever you discard a card, this creature deals 1 damage to each opponent. {1}{R}, Discard a card: Draw a card. Activate only if this creature is attacking.

Haste Whenever a creature you control attacks, this creature deals 1 damage to the player or planeswalker it's attacking.

Whenever another creature dies, you may have this creature deal 1 damage to target player or planeswalker.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) {1}, Sacrifice another creature: Put a +1/+1 counter on this creature.

Whenever this creature attacks or blocks, each player draws a card.

Whenever you discard one or more cards, this creature deals that much damage to each opponent. Cycling {1}{R} ({1}{R}, Discard this card: Draw a card.) When you cycle this card, it deals 1 damage to each opponent.

{1}{R}, {T}, Sacrifice this creature: Each player discards their hand, then draws seven cards.

Whenever another creature you control enters, this creature deals 1 damage to each opponent. Unearth {R} ({R}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

Menace Whenever a player casts their first spell each turn, they create a Treasure token. Whenever an artifact an opponent controls is put into a graveyard from the battlefield, this creature deals 1 damage to that player.

Psychosis Crawler's power and toughness are each equal to the number of cards in your hand. Whenever you draw a card, each opponent loses 1 life.

This creature has first strike during your turn. Whenever an opponent draws a card, this creature deals 1 damage to them.

Ward {2} As this creature enters, choose a creature type. This creature is the chosen type in addition to its other types. If a triggered ability of another creature you control of the chosen type triggers, it triggers an additional time.

At the beginning of your upkeep, each player draws a card. Whenever an opponent draws a card, that player loses 1 life.

During your turn, this creature has first strike. Whenever another creature dies, this creature deals 1 damage to target player or planeswalker.

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.

{R}, Sacrifice this creature: Destroy target artifact.

This spell costs {1} less to cast for each creature on the battlefield. Blasphemous Act deals 13 damage to each creature.

Choose one — • Burn Down the House deals 5 damage to each creature and each planeswalker. • Create three 1/1 red Devil creature tokens with "When this token dies, it deals 1 damage to any target." They gain haste until end of turn.

Each player draws three cards, then discards three cards at random.

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

Draw two cards, then discard two cards. Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Until end of turn, permanents you control gain "{T}: This permanent deals 1 damage to any target."

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

As an additional cost to cast this spell, discard a card. Draw two cards. If the discarded card wasn't a land card, Grab the Prize deals 2 damage to each opponent.

Choose two — • Incendiary Command deals 4 damage to target player or planeswalker. • Incendiary Command deals 2 damage to each creature. • Destroy target nonbasic land. • Each player discards all the cards in their hand, then draws that many cards.

For each player, choose friend or foe. Each friend discards all cards from their hand, then draws that many cards plus one. Khorvath's Fury deals damage to each foe equal to the number of cards in their hand.

Each player shuffles the cards from their hand into their library, then draws that many cards. Metalcraft — If you control three or more artifacts, Molten Psyche deals damage to each opponent equal to the number of cards that player has drawn this turn.

Choose a color. Sudden Demise deals X damage to each creature of the chosen color.

Exile target creature. That creature's controller reveals cards from the top of their library until they reveal a creature card. That player puts that card onto the battlefield, then shuffles the rest into their library.

Destroy target artifact you don't control. Overload {4}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")

Whenever a creature you control with power 1 or less attacks, this enchantment deals 1 damage to the player or planeswalker that creature is attacking.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.) If a source you control would deal damage to a permanent or player, it deals triple that damage instead.

Sacrifice a creature: This enchantment deals 1 damage to any target.

Whenever a creature you control enters, this enchantment deals 1 damage to each opponent.

If a red or artifact source you control would deal damage to an opponent or a permanent an opponent controls, it deals that much damage plus 1 instead.

As this enchantment enters, choose Khans or Dragons. • Khans — At the beginning of your upkeep, exile the top card of your library. Until end of turn, you may play that card. • Dragons — Whenever a creature you control leaves the battlefield, this enchantment deals 1 damage to any target.

Whenever a creature you control with power 2 or less attacks, this enchantment deals 1 damage to the player or planeswalker that creature is attacking.

Choose one — • Abrade deals 3 damage to target creature. • Destroy target artifact.

Add {R} for each creature you control.

Choose one — • Cathartic Pyre deals 3 damage to target creature or planeswalker. • Discard up to two cards, then draw that many cards.

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

If you control a commander, you may cast this spell without paying its mana cost. You may choose new targets for target spell or ability.

Spree (Choose one or more additional costs.) + {2}{R} — Untap all creatures you control. If it's your combat phase, there is an additional combat phase after this phase. + {2} — Creatures you control get +1/+0 and gain first strike until end of turn. + {R} — Choose target opponent. Whenever a creature you control deals combat damage to that player this turn, create a tapped Treasure token.

Add {R}{R}{R}{R}{R}.

Counter target spell. Choose 1, 2, or 3 at random. Its controller mills that many cards, then exiles cards from the top of their library until they exile a nonland card with a different name than that spell. They may cast that card without paying its mana cost. Then they put the exiled cards on the bottom of their library in a random order.