msem-instigator

Whenever a creature you control deals combat damage to a player, you may draw a card.
Fleeting {1}{U} (You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)

When Irticull's Vanguard enters, exile target nonland permanent an opponent controls until Irticull's Vanguard leaves the battlefield.
Reprocess {1}{W}{W}{W} (Cast a copy of this from your graveyard by exiling it and paying {1}{W}{W}{W}. Spend only mana from differently named sources this way.)

Target player creates two 1/1 white Spirit creature tokens with flying.
Fabled {3}{W}{W} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that player.)

Aeren Hellfire deals 4 damage to any target.
You may draw a card. If you do, discard a card.

When Thespian's Page enters, return target instant or sorcery card from your graveyard to your hand.

When Cultivator of Crops enters, you may search your library for a basic land or Satrapy card, reveal it, put it into your hand, then shuffle.

When Caustic Lurker dies, target player loses 1 life.

Target opponent discards two cards, then sacrifices a creature.

First strike, lifelink

Tomb of the Roseblade enters tapped.
{T}: Add {C}.
{X}, {T}, Sacrifice Tomb of the Roseblade: Search your library for an Equipment card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery.

Shuffle your hand into your library, then draw X cards.

Lifelink
If you would gain life, you may put that many +1/+1 counters on another creature you control instead.

Equipped creature gets +2/+2 and has protection from green and from white.
Whenever equipped creature deals combat damage to a player, you may reveal the top five cards of your library. Put a creature card revealed this way into your hand, then put the rest into your graveyard. Destroy up to one target enchantment.
Equip {2}

Rhapsody {3}{R}{R} (Pay {3}{R}{R} to cast this as a 4/4, or as a sorcery to make it become a 4/4.)
Whenever Vindictive Guardian or another creature you control enters, if that creature's power is 4 or greater, create a Treasure token.

Exile up to three target creatures you control, then return those cards to the battlefield under your control tapped.

Search your library for a basic land card or Desert card, reveal it, put it into your hand, then shuffle.
Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Target creature you control gains lifelink until end of turn. When that creature dies this turn, return it to the battlefield under your control with a +1/+1 counter on it. It becomes a Vampire in addition to its other types.

When Dutiful Counselor enters, adjudicate. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)
Whenever an Aura you control enters, you may pay {1}. If you do, target creature gets +1/+1 until end of turn.

This spell can't be countered.
Target player gains hexproof until end of turn.
Fabled {2}{W}{W} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that player.)

Each land doesn't untap during its controller's next untap step.

Motivate 2 (When this creature enters, you may motivate target creature with less power than this by putting two +1/+1 counters on it.)
Whenever a creature you control becomes motivated, you gain 2 life.

Heroic — Whenever you cast a spell that targets Pheres-Band Courser, put a +1/+1 counter on Pheres-Band Courser.

({T}: Add {R} or {W}.)
Spiraling Canyon enters tapped unless you control a basic Mountain or a basic Plains.

When Bitter Pact enters, destroy target nonbasic permanent.
All permanents and players lose hexproof, indestructible, and protection and can't have or gain hexproof, indestructible, or protection.

At the beginning of combat on your turn, if you cast an enchantment spell, an instant spell, and a sorcery spell this turn, create two 3/3 red Shark enchantment creature tokens. You may have any number of those tokens gain haste. If you do, sacrifice the tokens you chose at end of combat.