msem-instigator

Prevent all combat damage that would be dealt this turn by each creature without a counter on it.

Whenever a quest counter is put on a permanent you control, upgrade Selvar, the Seeker. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• First strike
• Vigilance
• Reach
• Trample
• Lifelink

Glitch {1} (Remove one [restriction] for each time you pay the glitch cost.)
Create a token that's a copy of target [noncreature] permanent [you control].

Reach (This creature can block creatures with flying.)
Whenever Deepwood Spider blocks a creature with flying, Deepwood Spider gains deathtouch until end of turn.

Whenever one or more creatures you control deal combat damage to a player, exile a nonland card from that player's graveyard. Copy it. You may cast the copy. (You still pay its costs, including color. Copies of permanents enter as tokens.)

Trample
When Dreaded of Sahra enters, creatures you control become 8/8 Demons in addition to their other types until end of turn.

Equipped creature gets +2/+2.
Equip {3}

Other Zombies you control get +1/+1.
Whenever Plague Herald or another Zombie enters under your control, target creature you control gains deathtouch until end of turn.

Batrest, Fellor Leader gets +1/+1 for each Equipment attached to it.
When Batrest enters, create Astrina, Forged for Glory, a legendary colorless Equipment artifact token with “Equipped creature gets +4/+4 and has first strike and lifelink” and equip {4}. Attach it to Batrest.

Enchant opponent
Whenever enchanted player searches their library, you may search your library for a card, put it into your hand, then shuffle.

{T}: Add {C}.
{T}, Reappropriate: Add {W} or {U}. (Exile exactly two cards from your hand and/or graveyard.)

Haste
When Magma Crawler enters, creatures you control with flash or haste get +1/+1 until end of turn.

Scry 3.
Monument {1}{U}{U} (You may cast this transformed from your graveyard for its monument cost. Exile it if it would leave the battlefield or not resolve.)

Equipped creature gets +1/+1 and has haste.
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)

Destroy target creature that was dealt damage this turn. (Then exile this card. You may cast the creature later from exile.)

Reverberate {3}{R} (When you cast this spell, copy it if you paid its reverberate cost. You may choose new targets for the copy.)
Searing Pulse deals 2 damage to any target.

First strike
Whenever Sighted-Caste Knight deals combat damage to a player, draw a card.

Discard your hand. Creatures you control get +X/+0 and gain first strike until end of turn, where X is the number of cards discarded this way.

Menace
Death knell — Put a +1/+1 counter on Guiltless Wraith. (As a creature you control dies, trigger one death knell of that creature or another permanent you control.)

Menace, ward {2}
Whenever Envoy of Divine Progress deals combat damage to a player, you may search your library for an enchantment card, reveal it, put it into your hand, then shuffle.

When Null Paradigm enters, conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)
Whenever you cast a sorcery spell, each opponent loses 1 life and you gain 1 life.

As an additional cost to cast this spell, discard two cards.
Target player draws two cards. Return up to one target creature to its owner's hand.

Lionize {2}{B} ({2}{B}, Exile this card from your hand: Put a +1/+1 counter on target creature and it gains the following abilities until end of turn. You may cast this card on a later turn from exile.)
Flying
Sacrifice a creature: Put a +1/+1 counter on this creature and tap it. Any player may activate this ability.

{T}, Discard your hand: If two or more cards were discarded this way, search your library for a card and put that card into your hand, then shuffle.

Non-Human creatures you control get +1/+0.