msem-instigator

Spearhead deals X damage to target player. (Then exile this card. You may cast the creature later from exile.)

When Nettlehowler enters, exile up to one target card from a graveyard.
If a creature dealt damage by Nettlehowler this turn would die, exile it instead.

As an additional cost to cast this spell, pay {2} or sacrifice a creature.
Flying, vigilance

Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.
{3}{W}{U}: Tap target creature and put a +1/+1 counter on Solitary Guardian.

Flash
Flying
When Meletis Stratomancer enters, target creature an opponent controls gets -2/-0 until end of turn.

First strike
Whenever a creature you control with power 4 or greater attacks, you may pay {1}{R}. When you do, target creature gets +3/+2 and gains trample until end of turn.

When Veins of the Intisuyu enters, draw a card, then choose a card name.
Whenever you cast a spell with the chosen name, search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Fury Swipes deals 2 damage divided as you choose among one or two targets. Scry 2.

Target opponent reveals their hand. You choose a card from it. Exile that card. If a land card is exiled this way, its owner may conjure a card named Plains, Island, Swamp, Mountain, or Forest on top of their library.

Artifact creatures you control can't be blocked by nonartifact creatures.
{2}{U}{R}: Put a +1/+1 counter on an artifact creature you control or a progress counter on a Project you control.

Adjudicate, then each player returns a creature they control that isn't enchanted to its owner's hand. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)

For each player, choose a creature or planeswalker that player controls. Each player sacrifices all creatures and planeswalkers they control not chosen this way.
Fuse (You may cast one or both halves of this card from your hand.)

Combined Generator can't be blocked except by three or more creatures.

Attacking creatures get -X/-0 until end of turn.

When Encrypted Monument is put into your graveyard from anywhere, you may pay {2} and exile it. If you do, draw two cards.

Target creature gets +2/+2 until end of turn. You may remove a -1/-1 counter from it.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature can't be blocked.
{1}{U}: Enchanted creature gains hexproof until end of turn.

Whenever you cast an instant or sorcery spell, upgrade Error Exploiter. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Flying
• Hexproof

{T}, Exert Weary Border Guard: Tap target creature. (An exerted creature won't untap during your next untap step.)

Corpse Thief can't be blocked by creatures with greater power.
Whenever Corpse Thief deals combat damage to a player, return target creature card from your graveyard to your hand.
{3}{G}{G}: Mill half your library, rounded down. Transform Corpse Thief. Activate only as a sorcery.

Steelborn Apprentice gets +1/+1 as long as you control an Equipment.

Target creature gains winnow until end of turn if you attacked this turn. Searing Insult deals 2 damage to that creature. (Damage dealt to it also causes its controller to lose that much life.)

{T}, Mill two cards: Add one mana of any color.

At the beginning of your first main phase, choose one —
• Artifact spells cost {1} less to cast until your next turn.
• Nonartifact spells cost {1} more to cast until your next turn.

Exile target artifact or enchantment. You gain 3 life.