msem-instigator

Put a +1/+1 counter on target creature. It gains indestructible until end of turn.

This spell costs {1} less to cast for each artifact you control.
Draw three cards, then Corecharge deals damage to any target equal to the number of cards in your hand.

Deathtouch
When Shadowed Apostle dies, draw a card.

{T}: Add {C}.
{T}, Tap an untapped creature you control: Add one mana of any color. You gain 1 life.

Whenever Arisen Helix attacks, scry 2.
If Arisen Helix would die, exile it instead.

Flying, ward {1}
Intisuyu's Masterpiece gets +X/+X, where X is the number of artifacts and/or enchantments you control.

Gestalt (When this or another creature enters under your control, you may merge it with the one in play, keeping counters and attachments. They become the permanent on top plus all abilities from under it.)
This creature can't be blocked by creatures with power 1 or less.

Draw two cards, then discard a card.

Creature tokens you control have hexproof.
{3}{G}: Put a +1/+1 counter on target creature token.

Ward—Sacrifice a permanent.
Whenever a player sacrifices a permanent, put a +1/+1 counter on Hayat, Hungering Bakhtak.
Surpass {4}{B}{G} ({4}{B}{G}: Transform this creature. This costs {1} less to activate for each counter on it. Activate only as a sorcery.)

Whenever Arcane Metalcrafter or another Wizard you control attacks, create a 1/1 colorless Construct artifact creature token that's tapped and attacking.
Whenever a Construct you control dies, Arcane Metalcrafter deals 1 damage to each opponent.

Whenever Instability Elemental enters or you draw a card except during your draw step, target creature gets +1/+1 until end of turn.

Flying
If a +1/+1 counter would be put on a creature you control, you may instead put your choice of a flying counter, a vigilance counter, or a trample counter on it.

All creatures able to block Orphaned Nuckalavee do so.

Voracious 1 (As this enters, you may sacrifice an artifact or creature. If you do, it enters with a +1/+1 counter on it.)
Vigilance, reach

Whenever Firefall Praetorians attacks, exile the top card of your library then copy it. You may play the copy and/or the exiled card.

As Destroyed Isle enters, you may pay 3 life. If you don't, it enters tapped.
{T}: Add {W}, {U}, or {B}.

Rhapsody {4}{U}{U} (Pay {4}{U}{U} to cast this as a 4/4, or as a sorcery to make it become a 4/4.)
When Unstable Prophet enters, surveil X, where X is its power. (Look at the top X cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)

Whenever Grin, Scourge of Goresand attacks, when you next cast an instant or sorcery spell with mana value 3 or less this turn, copy that spell. You may choose new targets for the copy.
Dash {2}{R} (You may cast this spell for its dash cost. If you do, it gains haste, and it's returned from the battlefield to its owner's hand at the beginning of the next end step.)

Trample
When Nanowrought Progenitor enters, draw a card for each creature you control with two or more card types.

Create two 1/1 green Insect creature tokens. (Cast a copy of this spell once while this creature is on the battlefield.)

Target creature gets +X/+X and gains trample until end of turn.
If you've sacrificed a permanent this turn, draw a card.

Whenever you discard one or more cards, create a Treasure token and draw a card. This ability triggers only once each turn.
Whenever two or more creatures you control attack, you may discard a card. If you do, target creature can't block this turn.

Flash
When Blade of Mautakesh enters, creatures you control gain poisonous 1 until end of turn. (Whenever those creatures deal combat damage to a player, that player gets a poison counter. Multiple instances of poisonous trigger separately.)

Search your library for up to two basic land cards, reveal those cards, put one onto the battlefield tapped and the other into your hand, then shuffle.