msem-instigator

When Ema, the Traveler enters, reveal the top five cards of your library. Put any number of legendary cards revealed this way into your hand and the rest on the bottom of your library in any order.
{2}{B}: Another target legendary permanent gains indestructible until end of turn.

Look at the top seven cards of your library. Put two of them into your hand and the rest into your graveyard.

{1}, Sacrifice Penny Dreadful: Target creature can't attack or block this turn.
{1}, Sacrifice Penny Dreadful: Draw a card.

Equipped creature gets +1/+0.
Equipped creature has deathtouch as long as it's attacking.
Equip {1}

Up to two target creatures can't block this turn. Scry 1.

Choose one —
• Return target instant or sorcery card from your graveyard to your hand.
• Return target exiled card with agonize you own to your hand.
Exile Romantic Recollections.

Put a +1/+1 counter on up to one target creature. Untap it. You gain 3 life.

When Reha, Entropy's Call enters, you may search your library for any number of land cards with different names and exile them with harvest counters, then shuffle.
At the beginning of your upkeep, you may put a card that you own in exile with a harvest counter on it at random onto the battlefield tapped.

Harmony — Add one mana of any color.
{1}, {T}: Harmonize. Then sacrifice Dragonglass Harp. (To harmonize, trigger up to one harmony of a permanent you control.)
When Dragonglass Harp is put into a graveyard from the battlefield, draw a card.

Enchant permanent
Whenever a counter is removed from enchanted permanent, you may put a counter of that type on another target permanent.

When Ancient of the Glade enters, put a +1/+1 counter on each other creature you control.
{2}, Remove a +1/+1 counter from a creature you control: That creature gains indestructible until end of turn.

Destroy target artifact.
Catalyze. (The next spell you cast this turn costs {1} less to cast.)

Whenever you cast an Azra spell, mill three cards.
Whenever you cast a Demon spell, you may return an Azra card with lesser mana value than that spell from your graveyard to the battlefield.

Whenever you cast a black spell, you may exile target creature. Return that card to the battlefield under its owner's control at the beginning of the next end step.
Whenever you cast a red spell, you may have Haunted Sunseeker deal 1 damage to each creature.

Menace
When Beatrice enters, target opponent reveals their hand. Exile a nonland card from it. During any turn that player lost life, you may cast that card and mana of any type can be spent to cast that spell.

Flying, haste
{2}{R}{R}, Exile a multicolored card from your graveyard: Return Rainbow Phoenix from your graveyard to the battlefield tapped. If it's your declare attackers step, it enters attacking.

Archive 3 (As this enters, shuffle the top three cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Whenever a source you control deals noncombat damage to a player, draw a card from the archived library.

Whenever a creature you control enters, you may have it get +1/+1 until end of turn. If you do, it fights target creature. (Each deals damage equal to its power to the other.)

Target creature gains indestructible until end of turn. Whenever that creature perseveres this turn, create a 1/1 white Nymph creature token. (A creature perseveres when it survives damage.)

Each opponent sacrifices a creature that dealt damage this turn. You gain 2 life, then abound. (To abound, you may cast a spell that costs less than this from your hand without paying its mana cost.)

Whenever Pilgrim of Xifang's Climb blocks a creature, that creature doesn't untap during its controller's next untap step.

Transcend (Activate as a sorcery to gain the next type and a +1/+1 counter.)
Flying
{1}{W}: Demigod — Return up to one target creature card with mana value 2 or less from your graveyard to the battlefield.
{3}{W}: God — Put a +1/+1 counter on each creature you control with the least power among creatures you control.

Deathtouch
Putrid Lurker can't block.
Whenever you discard Putrid Lurker or another card, you may pay {B}. If you do, return Putrid Lurker from your graveyard to the battlefield.

Equipped creature has haste.
Sacrifice Cinderblade: Equipped creature gains +2/+2 until end of turn.
Equip {1}

Scry 3, then reveal the top card of your library. Target creature gains trample and gets +X/+X until end of turn, where X is that card's mana value.