msem-instigator

Add {R} and two mana of any one color.
When you next cast a spell this turn, Manifest Irrationality deals 3 damage to any target.

{4}, {T}, Sacrifice Yenzu Ritual Vessel: Yenzu Ritual Vessel deals 4 damage to target creature or planeswalker.

Search your library for up to six cards and exile them face down. Shuffle, then draw a card.

Concord — When Riptide Mystic enters, if there are four or more card types among permanents you control, you may return target nonland permanent to its owner's hand.

{T}: Add {C}.
{4}, {T}, Sacrifice Elgaud Fortress: Create a token that's a copy of target artifact you control. Activate only as a sorcery.

Deception {2}{B} ({2}{B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever Grinning Torturer deals combat damage to a player, torment that player. (They lose 3 life unless they discard a card or sacrifice a nonland permanent.)

{1}{R}, Discard a card: Draw a card.
{R}: You may put a creature card from your hand onto the battlefield. That creature gains haste. Activate only if twenty or more cards are in your graveyard.

Whenever you make first contact, you may activate one of Karina's loyalty abilities. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)
[+1]: Each player draws a card.
[–2]: Exile target nonland permanent. At the beginning of the next end step, return it to its owner's hand or to the battlefield under its owner's control.
[–7]: You get an emblem with “You may cast spells that don't have the same name as a permanent you control or a card in your graveyard without paying their mana costs.”

Flash
Whenever another permanent dies, put a +1/+1 counter on Heyu.
{1}{G}: Heyu becomes a colorless Island land until end of turn.

Prowess
Whenever you cast a noncreature spell, target creature can't block this turn.

Reveal the top four cards of your library. You may put a creature card and/or a land card from among them into your hand. Put the rest into your graveyard, then discard a card if two cards were put into your hand this way.

Flash
When Pivot-Fist Meditant enters, choose a creature you control. Whenever that creature is dealt damage this turn, it deals that much damage to any other target.

Reach
Canopy Scout gets +1/+0 for each land card in your graveyard.

Choose a card name, then look at the top card of your library. If it has the chosen name, you may exile it and you may play it from exile until end of turn.
Whenever a creature you control becomes tapped, you may return Enigma of Seventy Scrolls from your graveyard to your hand.

{R}, {T}, Discard a card: Draw a card.
{2}{R}, {T}, Sacrifice Dismissive Pyromancer: It deals 4 damage to target creature.

Enchant player
For each 1 life enchanted player would gain, you gain 1 life instead unless that player pays {1}.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever a creature you control deals combat damage to a player, you may have Aspect of Rage deal 1 damage to any target.

Lifelink
Sacrifice Devoted Apothecary: Remove a counter from target permanent.

You may activate abilities of nonland permanents your opponents control.

Flash
When Mighty Beetle enters, you may put two +1/+1 counters on target creature you control.

Creature spells you cast cost {2} less to cast.
Whenever a creature you control enters, if it doesn't have vanishing, put four time counters on it and it gains vanishing.

Counter target instant or sorcery spell you don't control unless its controller copies it twice. You gain control of those copies and may choose new targets for them.

Rouse 1. Target permanent gains first strike until end of turn if it's a creature. (Put a +1/+1 counter on a permanent you control. If it isn't a creature, tap it and it becomes a 0/0 creature in addition to its other types.)

First strike
Whenever a creature blocks Celestial Conscript, put a -1/-1 counter on that creature.

Vanishing 2 (This permanent enters with two time counters on it. At the beginning of your upkeep, remove a time counter from it. When the last is removed, sacrifice it.)
Whenever a time counter is removed from Evade the Authorities, you may return target creature to its owner's hand.