msem-instigator

Choose three. You may choose the same mode more than once.
• Target player creates two 1/1 white Soldier creature tokens. They gain haste until end of turn. Exile them at the beginning of the next end step.
• Dthan's Confluence deals 2 damage to target creature or planeswalker.
• Target creature gains double strike until end of turn.

Investigate, then counter target spell unless its controller pays {1} for each Clue you control. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Whenever you cast an instant or sorcery spell, target creature gets +1/+1 until end of turn.

Target creature you control gains haste until end of turn. Return it to its owner's hand at the beginning of the next end step.

When Naive Apprentice enters, each player creates a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
As long as an opponent controls an artifact, Naive Apprentice gets +2/+0.

Other creatures you control can't attack or block alone.

Flying
Whenever you cast a spell, exile the top card of your library.
At the beginning of your end step, put a card exiled with Korephyr, Riddle Sage into its owner's hand. Put each other card exiled with Korephyr on the bottom of its owner's library in a random order.
{3}{U/B}: Scry 2.

Tap up to two target creatures. Those creatures don't untap during their controller's next untap step.

Flash
Unveil {3}{B}{G} ({3}{B}{G}: Transform this. Unveil only as a sorcery.)

Flash
Flying
When Pixie Procurer enters, copy target activated ability, triggered ability, or spell with mana value 2 or less. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

When Frostfield Swordsman enters, arm it. (Create a colorless Equipment artifact token with “Equipped creature gets +1/+0” and equip {2}, then attach it to that creature.)

Altar of Order enters tapped.
{T}: Add {W}.
{T}: Add {U} or {R}. Altar of Order doesn't untap during your next untap step unless you control an Angel creature.

Enchant creature
Prevent all damage that would be dealt by enchanted creature.

When Abomination Emissary enters, target player mills six cards.

Destroy target artifact, enchantment, or creature with flying.

Changeling (This card is every creature type.)
Watcher of the Polyps has all names of creature cards in addition to its name as long as it's on the battlefield.
Watcher of the Polyps gets +X/+X, where X is the greatest number of creatures you control with the same name.

This spell costs {1} less to cast for each tapped creature your opponents control.
{5}{U}: Evigian Titan can't be blocked this turn.

Whenever you cast a spell, you gain 1 life for each of its colors other than white.

Knight of the Olive Orchard can't be blocked by more than one creature.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
{1}{W}: Target creature and all creatures with the same name as that creature get +0/+1 until end of turn.

Draw two cards.
Dominance — Draw three cards instead if you control the creature with the greatest power or tied for the greatest power.

Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.
Flashback {3}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{1}, {T}, Move a -1/-1 counter from another creature onto Dockside Healer: You gain 2 life.

This spell can't be countered.
Polis's Demise deals 5 damage to each creature. Destroy all artifacts.

Flash
{U}, Put Elusive Hunter into its owner's library second from the top: Counter up to one target spell unless its controller pays {2}.