msem-instigator

Up to two target creatures can't be blocked this turn. (Then exile this card. You may cast the creature later from exile.)

When Ralezza's Disciple enters, if you control an enchantment, you gain 3 life.

When Weald Sentry enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
When Weald Sentry dies, draw a card.

Equipped creature gets +2/+2.
Whenever equipped creature deals combat damage to a player, exile cards from the top of their library until they exile a nonland card. You may cast that card without paying its mana cost.
Equip {2}

{T}, Pay 1 life: Add {R}.
{T}, Pay 1 life, Sacrifice Sunwashed Spires: Search your library for a Mountain card, put it onto the battlefield tapped, then shuffle.

Menace
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Enchant land
Enchanted land has “{T}: Exile the top card of your library. If it's a nonland card, you may cast that card this turn.”

Target opponent chooses up to one creature. Destroy the rest.

Cosmic Catastrophe deals 6 damage to target creature or planeswalker. If you control a creature with power greater than its base power, Cosmic Catastrophe deals 3 damage to each opponent.

At the beginning of your end step, shuffle your hand and graveyard into your library, then draw seven cards.

Return target creature or planeswalker card with mana value 3 or less from your graveyard to the battlefield. If it’s an Eli planeswalker, put a loyalty counter on it. (Cast a copy of this spell once while this planeswalker is on the battlefield.)

Lifelink
Whenever Painstriker attacks, it deals 2 damage to target creature defending player controls.

Defender
Territorial Fangwurm may attack as though it didn't have defender as long as you've cast a cryptic spell this turn. (Artifacts, enchantments, and modal spells are cryptic.)

{T}: Add one mana of any color.
Augmented — As long as you've spent {W}{U}{B}{R}{G} to cast spells this turn, spells you control can't be countered.

Supply Run costs {2} less to cast if a creature you controlled attacked this turn and wasn't blocked.
Draw two cards.

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Lord of Swarms enters or dies, target creature gets -2/-2 until end of turn.

{T}: Add one mana of any color. Activate only if you control a multicolored permanent or there is a multicolored card in your graveyard.

Flash
Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{W}{B}: Kirishima's Escort gets +1/+1 and gains first strike until end of turn.

Whenever Leija, the Bloodied Queen attacks, you may pay {R}{R}{R}{R}. If you do, it deals 4 damage to each other creature, each player, and each planeswalker.

Whenever you innovate, put a loyalty counter on Volta the Innovator. (You innovate as you cast a spell, draw a card, or have a land enter beyond the first of each in a turn.)
[–2]: If you would draw a card this turn beyond the first, draw twice that many cards instead.
[–3]: Whenever you cast your second spell this turn, copy it. You may choose new targets for the copy.

Enchant player
When Curse of the Vein enters, create a 1/1 black and red Vampire creature token with menace.
Whenever enchanted player is attacked, Curse of the Vein deals 1 damage to them.

When Zhedina Provisioner enters, creatures you control get +1/+1 until end of turn. You gain 2 life.

Ferocious — Once each turn, when a creature you control with power 4 or greater enters, you may untap all lands you control.

Search your library for a nonland card not named Thin the Veil, exile it, then shuffle. If it has mana value less than or equal to the number of card types among cards in your graveyard, you may cast it without paying its mana cost. If you don't, put it into your hand.

When Crinster Tattooist enters, put a +1/+1 counter on each tapped creature you control.