msem-instigator

Cards in graveyards, exile, and libraries lose all abilities and card types.

Whenever a creature an opponent controls dies, its controller loses 1 life.
At the beginning of each opponent's upkeep, put a -1/-1 counter on each creature that player controls.

Whenever The First Idol attacks, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
Sacrifice three Idols: Return The First Idol from your graveyard your hand.

Look at the top sixteen cards of your library. Put any number of creature cards with different mana values from among them onto the battlefield and the rest on the bottom of your library in any order.

Vanishing 5
The High Prairies enters tapped.
{T}: Add one mana of any color.

Destroy all lands. For each land destroyed this way, its controller creates a colorless land token named Blasted Lands with “{T}: Add {C}.”

Flying
You pay {0} to cast your first spell each turn rather than its mana cost. If you cast a spell with {X} in its mana cost this way, X is 8.

Counter target spell unless its controller pays {3}. That spell's controller mills three cards.

When The Moon Rises enters, exile all opponent's graveyards.
At the beginning of your upkeep, each opponent loses 1 life.

Flash
{1}{W}: Exile target creature that dealt damage to you this turn until The Shield leaves the battlefield.

At the beginning of each player's end step, that player chooses from among nonland permanents they control an artifact, a creature, an enchantment, and a planeswalker, then sacrifices the rest.

For each creature, its owner puts it on the top or bottom of their library.

[0]: Creatures you control gain haste until end of turn. Whenever a creature attacks this turn, put a loyalty counter on The Warrior Within.
[–1]: Exile the bottom two cards of your library. You may play one of them this turn.
[–6]: Untap each creature that attacked this turn. After this main phase, there is an additional combat phase.

Creatures you control get +2/+0 until end of turn.
Metamorph {1}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up and cast it at any time for its metamorph cost.)

Equipped creature gets +1/+0 and has “Whenever this creature deals combat damage to a player, draw a card.”
Equip {3}

Reach, deathtouch

Purge, then you may pay 2 life. If you do, purge again. (To purge, exile two cards that share a type from graveyards. If you do, draw a card.)

Whenever an opponent draws a card except during their draw step, adjudicate. (Create a white Aura enchantment token with enchant creature and “Sacrifice this token: Untap enchanted creature” attached to target creature.)
Whenever an enchanted creature you control deals combat damage to a player, draw a card.

When Thoughtgrinder enters, each player discards a card.
Unearth {1}{U}{B} ({1}{U}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the end step or if it would leave the battlefield. Unearth only as a sorcery.)

Return two instant and/or sorcery cards at random from your graveyard to your hand. Exile Thoughts Reborn.

Menace (This creature can't be blocked except by two or more creatures.)

Attacking creatures get +2/+0 until end of turn.
Armed — Equipped creatures you control get an additional +1/+0 until end of turn.

Enchant creature
Enchanted creature gets +3/+1.

As an additional cost to cast this spell, sacrifice a land.
Creatures you control get +1/+1 and gain trample until end of turn for each land you control.

Exile any number of target creatures and/or planeswalkers you control. You gain 1 life for each card exiled this way, then return them to the battlefield under your control.