msem-instigator

As an additional cost to cast this spell, pay {2} or reveal an instant or sorcery card from your hand.

Private Library enters tapped.
When Private Library enters the battlefield, look at the top card of your library. You may put it into your graveyard.
{T}: Add {W} or {U}.

Prowess
Whenever Prodigal Spark is dealt damage, it deals that much damage to any target.

If Professor Haldean would leave the battlefield, exile him instead.
Whenever you cast a spell, you may untap Professor Haldean and another target permanent.
{T}: Professor Haldean deals 1 damage to each opponent.

Target creature you control fights another target creature.
Each player draws a card.

{T}: Add one mana of any color.
{4}, {T}, Sacrifice Prototype Engine: Put four -1/-1 counters on target creature.

{T}, Pay 1 life: Add {G} or {W}.
{2}, {T}, Sacrifice Provincial Hamlet and another permanent: Draw a card. Activate only during your turn.

At the beginning of your end step, if you control two or more tapped creatures, you may exile target creature. If you do, return that card to the battlefield under its owner's control.

As Publishing Press enters the battlefield, you may exile a nonland card with mana value 2 or less from your hand.
At the beginning of your upkeep, you may cast a copy of the exiled card without paying its mana cost if the spell's mana value is 2 or less.

Harmony — Pyrodancer deals 1 damage to each opponent.
When Pyrodancer enters the battlefield, harmonize. (Trigger up to one harmony of one permanent you control.)

Pyrophoric Blast deals 3 damage to target creature. If that creature would die this turn, exile it instead.

The next sorcery spell you cast this turn can be cast as though it had flash.
Draw a card.

Enchant creature
When Ravage of Moments enters the battlefield and at the beginning of your upkeep, put a -1/-1 counter on enchanted creature.

You may have Reaping Willow assign its combat damage as though it weren't blocked.
{2}{G}: Reaping Willow gains indestructible until end of turn.

Tap up to three target lands. They don't untap during their controller's next untap step.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Exile the top three cards of your library. Until the end of your next turn, you may cast nonland cards exiled this way.
{3}{U}{R}: Return Reckless Experiment from your graveyard to the
battlefield tapped and transformed.

Flash

Flash
Prowess
When Reconstructed Adept enters, target instant or sorcery card in your graveyard gains agonize until end of turn. (You may cast it by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile that card.)

Counter target spell.
Create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)

Instant and sorcery spells you cast cost {1} less to cast.
Whenever you cast an instant or sorcery spell, Regrets of Mortals gets +2/+0 until end of turn. You may discard a card. If you do, draw a card.

Deploy 3 (As this enters, you may tap any number of other creatures you control with total power 3 or more.)
When Relief Battalion enters deployed, draw a card.

Vigilance
Disgraced 1 (This enters with a -1/-1 counter. Whenever it deals combat damage to a player, remove all -1/-1 counters from it.)

Target creature gets -4/-0 until end of turn. If you control two or more tokens, draw a card.

When Renatured Vines enters the battlefield, draw a card and create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
Renatured Vines power and toughness are each equal to the number of cards in your hand.

Whenever a creature enters the battlefield, each opponent loses 1 life.