You don't lose unspent red mana as steps and phases end. Magecraft — Whenever you cast or copy an instant or sorcery spell, discard a card, then draw a card. If this is the second time this ability has resolved this turn, Ashling deals 2 damage to each opponent and each creature they control. If it's the third time, add {R}{R}{R}{R}.

Offspring {2} (You may pay an additional {2} as you cast this spell. If you do, when this creature enters, create a 1/1 token copy of it.) Whenever you cast a noncreature spell, this creature deals 1 damage to each opponent.

Flash When this creature enters, copy target instant or sorcery spell. You may choose new targets for the copy.

Defender Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent.

Whenever you cast an instant or sorcery spell, this creature deals 1 damage to each opponent.

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

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

Whenever an opponent casts a noncreature spell, this creature deals damage equal to its power to that player. Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)

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

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) If an ability of a Shaman or another Wizard you control triggers, that ability triggers an additional time.

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

This spell can't be countered. Flying Whenever you draw a card, Niv-Mizzet deals 1 damage to any target. Whenever a player casts an instant or sorcery spell, you draw a card.

Flying Whenever you draw a card, Niv-Mizzet deals 1 damage to any target. {T}: Draw a card.

This creature gets +1/+0 for each artifact you control. Magecraft — Whenever you cast or copy an instant or sorcery spell, create a Treasure token.

Haste Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.) Instant and sorcery spells you cast cost {1} less to cast.

Defender {T}: This creature deals 1 damage to each opponent. Whenever you cast an instant or sorcery spell, untap this creature.

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

{1}, {T}: Add {U}{R}.

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

You have no maximum hand size. {T}: Add {C}.

At the beginning of your upkeep, put two descent counters on this enchantment. Then each player creates X Treasure tokens and this enchantment deals X damage to each player, where X is the number of descent counters on this enchantment.

Add {R}{R}{R}. Splice onto Arcane {1}{R} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

{T}: Add one mana of any color that a land an opponent controls could produce.

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

Add {R}{R}{R}.

Add {R}{R}, then add {R} for each card named Rite of Flame in each graveyard.

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

Whenever you cast a red spell, if this creature has fewer than three +1/+1 counters on it, put a +1/+1 counter on this creature. Remove three +1/+1 counters from this creature: Add {R}{R}{R}.

Exile this card from your hand: Add {R}.

{T}: Add {C}. {T}: Add {U} or {R}. This artifact deals 1 damage to you.

Counter target spell.

Devoid (This card has no color.) This spell costs {2} less to cast if an opponent controls a multicolored permanent. Ghostfire Slice deals 4 damage to any target.

Lightning Bolt deals 3 damage to any target.

Price of Progress deals damage to each player equal to twice the number of nonbasic lands that player controls.

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

Counter target enchantment, instant, or sorcery spell. Its controller creates a 2/2 blue Bird creature token with flying.

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.

Return target creature to its owner's hand. Untap up to two lands.

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

{T}: Add {C}. {U/R}, {T}: Add {U}{U}, {U}{R}, or {R}{R}.

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

{T}: Add one mana of any color that a land an opponent controls could produce.

({T}: Add {U}.)

({T}: Add {R}.)

You have no maximum hand size. {T}: Add {C}.

This land enters tapped unless you control two or more other lands. {T}: Add {U} or {R}.

Acidic Soil deals damage to each player equal to the number of lands they control.

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

Boltwave deals 3 damage to each opponent.

You may exile a red card from your hand rather than pay this spell's mana cost. Cave-In deals 2 damage to each creature and each player.

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.

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

End the Festivities deals 1 damage to each opponent and each creature and planeswalker they control.

Flame Rift deals 4 damage to each player.

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.

Grapeshot deals 1 damage to any target. Storm (When you cast this spell, copy it for each spell cast before it this turn. You may choose new targets for the copies.)

Add {R} for each card in your hand.

Add {R} for each tapped land your opponents control.

Exile target card that's an instant or sorcery from your graveyard. For each card exiled this way, copy it, and you may cast the copy without paying its mana cost. Exile Mizzix's Mastery. Overload {5}{R}{R}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")