msem-instigator

Whenever an Aura you control becomes attached to a creature, choose one —
• Raiding Gnoll-Band deals 3 damage to that creature.
• That creature gets +3/+0 until end of turn.

Artifacts and lands enter tapped.

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn.
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.)

Pay any amount of life. Look at twice that many cards from the top of your library and put one into your hand. Exile the rest.

Menace
Whenever Skhorvall Warleader attacks, it gets +1/+0 until end of turn for each other attacking Warrior you control.

Enchant creature you control
Whenever enchanted creature attacks, you draw a card and you lose 1 life.
{2}{B}, Sacrifice a creature: Return this card from your graveyard to the battlefield.

Other Warriors you control get +2/+0.
Whenever a Warrior you control dies, Bloodshed Devotee deals 1 damage to target opponent.

Advance {1}{R}{W}{B} (Cast this for {1}{R}{W}{B} to advance it as it enters. {1}{R}{W}{B}: Advance this as a sorcery.)
Whenever Blastburn Angel advances, it gets +1/+1 and gains flying until end of turn. It deals 1 damage to each other creature.

When Silver Gardener enters, create a 1/1 green Saproling creature token.
Unveil {2}{G}{W} ({2}{G}{W}: Transform this. Unveil only as a sorcery.)

Whenever equipped creature attacks or blocks, add {W}{U}{B}{R}{G}.
Equip {1}

Vigilance
Whenever Watchful Navigator crews a Vehicle, that Vehicle gets +1/+1 and gains vigilance until end of turn.

When Acolyte of Night dies, each opponent loses 1 life.

Look at target opponent's hand. You may exile a noncreature, nonland card from it. For as long as that card remains exiled, its owner may cast it. A spell cast this way costs {2} more to cast.
Draw a card.

Enchant creature
Enchanted creature gets +1/+1.
Whenever enchanted creature deals damage to a player or planeswalker, draw a card.

This spell costs {2} less to cast if an opponent was dealt combat damage this turn.
When Dastardly Duo enters, audition for black. (Create a 1/1 Construct Actor creature token, a Cleric Role giving 2/2 and lifelink, or a Warlock Role giving 2/1 and flying. Roles replace older ones.)

Trample
Avatar of the Groves enters with a +1/+1 counter on it for each land you control.
Landfall — Whenever a land you control enters, proliferate. (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)

When Truthseeker Prodigy enters, amass Soldiers 2. Then target player mills X cards, where X is the amassed Army's power. (To amass Soldiers 2, put two +1/+1 counters on an Army you control. It's also a Soldier. If you don't control an Army, create a 0/0 black Soldier Army creature token first.)

When Here Forever enters, exile target creature or planeswalker until Here Forever leaves the battlefield.
At the beginning of your upkeep, the owner of the exiled card loses 1 life.

Augmented — When you cast Want It All, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, copy Want It All for each other spell cast this turn.
Shuffle your library. Then exile the top card of your library. You may play it without paying its mana cost.

When Virtue of Propriety enters, return target creature card with mana value 3 or less from your graveyard to your hand.

Unattach all Equipment from target creature. Piercing Blow deals 3 damage to that creature.

Search your library for a basic land card, put it onto the battlefield, then shuffle.
Crystallize. (Put a +1/+1 counter on a creature you control or create a Treasure.)

Flying, lifelink, haste
{W}{U}{B}{R}{G}, Exile Remi Amber, Slyten Specialist: Return Remi Amber to the battlefield transformed at the beginning of your next main phase.

Trample, haste
All creatures able to block Crashing Mammoth do so.

Until end of turn, cards in graveyards lose all names, card types, and abilities.
Draw a card.