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.

Delayed Blast Fireball deals 2 damage to each opponent and each creature they control. If this spell was cast from exile, it deals 5 damage to each opponent and each creature they control instead.
Foretell

As an additional cost to cast this spell, sacrifice an artifact or discard a card.
Draw two cards.

Demon Bolt deals 4 damage to target creature or planeswalker.
Foretell

All creatures gain menace until end of turn.
Threshold — If there are seven or more cards in your graveyard, creatures can't block this turn.

Choose a source you control and flip a coin. If you win the flip, the next time that source would deal damage this turn, it deals double that damage instead. If you lose the flip, the next time it would deal damage this turn, prevent that damage.

Draw two cards, then discard a card at random.
Flashback

Add .
Splice onto Arcane

As an additional cost to cast this spell, you may sacrifice any number of Spirits.
Target creature gets +3/+0 until end of turn. For each Spirit sacrificed this way, that creature gets an additional +3/+0 until end of turn.

Split second
Create four 4/4 red Devil creature tokens with haste and "When this creature dies, create a Treasure token." Sacrifice the Devil tokens at the beginning of the next end step.

Attacking creatures get +2/+0 until end of turn. Dinosaurs you control gain trample until end of turn.

Cast this spell only during combat before blockers are declared.
Untap target attacking creature and remove it from combat. Gain control of that creature until end of turn.

This spell can't be copied.
Copy any number of target instant and/or sorcery spells. You may choose new targets for the copies.

Target blocking creature fights another target blocking creature.

Undaunted
Exile two target creatures. For each of those creatures, its controller reveals cards from the top of their library until they reveal a creature card, puts that card onto the battlefield, then shuffles the rest into their library.

Dogpile deals damage to any target equal to the number of attacking creatures you control.

Target creature you control deals damage equal to its power to target creature an opponent controls.
Fuse

Double the power of each creature you control until end of turn.

You may sacrifice a Mountain rather than pay this spell's mana cost.
Target creature gets +X/+0 until end of turn, where X is the number of Mountains you control.

As an additional cost to cast this spell, you may reveal a Dragon card from your hand.
Draconic Roar deals 3 damage to target creature. If you revealed a Dragon card or controlled a Dragon as you cast this spell, Draconic Roar deals 3 damage to that creature's controller.

Add for each attacking creature you control. Until end of turn, attacking creatures you control gain ": This creature gets +1/+0 until end of turn."

As an additional cost to cast this spell, you may reveal a Dragon card from your hand or choose a Dragon you control.
Dragon's Fire deals 3 damage to target creature or planeswalker. If you revealed a Dragon card or chose a Dragon as you cast this spell, Dragon's Fire deals damage equal to the power of that card or creature instead.

Until end of turn, target attacking creature gets +2/+2 and gains trample and "Whenever this creature deals combat damage to a player, destroy target artifact that player controls."

Choose one —
• Put five charge counters on target Spacecraft or Planet you control.
• Destroy target artifact.

Dual Shot deals 1 damage to each of up to two target creatures.

When you next cast an instant or sorcery spell with mana value 4 or less this turn, copy that spell. You may choose new targets for the copy.
Foretell

One or more target creatures become red until end of turn.

Target creature you control gets +2/+0 until end of turn.
Overload

Earth Tremor deals damage to target creature or planeswalker equal to the number of lands you control.

Eelectrocute deals 2 damage to any target.
You may cast this card from your graveyard as long as you've rolled a 6 this turn. If you cast it this way and it would be put into your graveyard, exile it instead.