msem-instigator

When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

Enchant creature without flying
Enchanted creature gets +10/+0 and attacks each combat if able.

Until end of turn, target creature gets +1/+0 and gains “Whenever this creature is dealt damage, exile that many cards from the top of your library. Until end of turn, you may play those cards.”

Arm target creature you control. It deals damage equal to its power to any target. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

Attacking creatures you control get +1/+0.
Mirage {2}{R} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

As an additional cost to cast this spell, discard a card.
Draw two cards. Then if you cast another instant or sorcery spell this turn, draw a card.

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

Torrent of Ankuliths deals 5 damage to target creature. Create a 1/1 red Elemental creature token.

As an additional cost to cast this spell, you may discard a card. If you do, this spell costs {4} less to cast.
Total Process Failure deals 5 damage to target creature or planeswalker. If that creature or planeswalker would die this turn, exile it instead.

Target creature gets +1/+0 until end of turn. Add {R}.

Towering Inferno deals X damage to each creature without flying. If a creature you don't control dealt damage this way would die this turn, exile it instead.

Whenever a nonland permanent enters under an opponent's control this turn, gain control of that permanent until the end of your next turn. It gains haste until end of turn.

When you cast this spell, copy it for each player that has 8 or less life. (The copies have the same target.)
Traitor's Execution deals 3 damage to target player.

Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.)
{2}, Discard your hand: Unlock Traitor's Gambit. If the revealed card is red, put it into your hand. Otherwise, put it on top of your library.

When Transformative Paints enters, create a 1/1 white Human creature token, then attach Transformative Paints to it.
Equipped creature gets +1/+0 and has prowess.
Equip {3}

Create two 1/1 red Elemental creature tokens.
Spell mastery — If there are two or more instant and/or sorcery cards in your graveyard, you may change the targets of up to one target spell or ability.

Up to two target creatures can't block this turn.

When Treasure Hoard enters, create a 2/2 blue Rogue creature token.
{2}{R}, Tap an untapped creature you control, Sacrifice Treasure Hoard: Create two Treasure tokens. (They're artifacts with “{T}, Sacrifice this artifact: Add one mana of any color.”)

As an additional cost to cast this spell, discard a land card.
Exile the top two cards of your library. Until end of turn, you may play those cards.

Triumphant Return deals 3 damage to up to one target creature. You may put an exiled creature card you own that's on an Adventure into your hand.

When Truthseeker's Blade enters, it deals 2 damage to target creature you don't control.
Equipped creature gets +2/+0.
Equip {3}

Choose one —
• When you next cast an instant or sorcery spell this turn, copy that spell. You may choose new targets for the copy.
• Target creature you control gains double strike until end of turn

Mountains you control have “{T}: Add {R}{R}.”
[+2]: Exile the top card of your library. You may play that card until the end of your next turn.
[–2]: Conjure six cards named Scorch. Shuffle them and your hand into your library, then draw two cards.

Archive 5 (As this enters the battlefield, shuffle the top five cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Eureka! (At the beginning of each end step, you get a research counter if you cast a spell this turn. Then if you have eight or more research counters, remove them and create a Masterpiece token of your choice.)
When you get your eighth research counter, exile Turin's Study, then you may cast any number of nonland cards from the archived library without paying their mana costs.

{1}{R}, Discard a card: Draw a card.
{R}: You may put a creature card from your hand onto the battlefield. That creature gains haste. Activate only if twenty or more cards are in your graveyard.