msem-instigator

Target opponent discards two cards. You create a 0/1 black Cultist creature token with “{1}{B}{B}, Sacrifice three Cultists: Create a 5/5 black Demon creature token.”

Nilchain Altar enters tapped.
{T}: Add {W} or {B}.
{W}{B}, {T}, Sacrifice Nilchain Altar: Conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

Target creature you control gets +0/+6 until end of turn and can block an additional creature this turn. Untap it.

Equipped creature gets +2/+1 and has flying.
Equip Wizard or Shaman {2}
Equip {4}

Destroy all creatures. Each player creates a tapped colorless land token named Lotus Spring with “{T}: Add one mana of any color.”

Target creature you control fights target creature you don't control.

Enchant creature
Enchanted creature gets -X/-X, where X is 1 plus the number of counters on it.

Braineater Abominus can't be blocked by creatures with power 4 or greater.
Whenever a creature you control deals combat damage to a player, exile the top card of that player's library. You may play that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast it.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
{2}{G}: Crazed Sprareos gets +2/+2 until end of turn. Activate only once each turn.

Enchant creature
Whenever enchanted creature deals combat damage to a player, you may search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Flying, haste
Whenever another creature dies, Twinfire Dragon gets +1/+0 until end of turn.

Whenever Devourer of Legacy deals combat damage to a player, you may sacrifice it and choose a nonland card name. If you do, search that player's graveyard, hand, and library for any number of cards with that name and exile them. That player shuffles, then draws a card for each card exiled from their hand this way.

Target creature gets +2/+2 for each creature blocking it and gains trample until end of turn.
Fuse (You may cast one or both halves of this card from your hand.)

Defender (This creature can't attack.)
Mirage {0} (You may cast this spell as though it had flash for its mirage cost. If you do, sacrifice it at the beginning of the next cleanup step.)

Whenever Queen Hannaru enters or attacks, put a +1/+1 counter on another target creature you control.
At the beginning of your upkeep, if there are four or more +1/+1 counters among creatures you control, you may transform Queen Hannaru.

When Tempting Shahmaran enters, gain control of target creature. Untap it and it gains haste. At the beginning of the next end step, exile that creature and put X +1/+1 counters on Tempting Shahmaran, where X is that creature's power.
Tempting Shahmaran has all activated abilities of cards exiled with it.

[+1]: Discard a card. If you do, up to one target player gains 5 life.
[–3]: Discard a card. You draw X cards and you lose X life, where X is that card's mana value.
[–7]: Exile your hand, then put all cards from your graveyard into your hand and all cards exiled this way into your graveyard.

Assault {2}{G} (Whenever this attacks, if it has no +1/+1 counters on it, you may pay its assault cost to put a +1/+1 counter on it.)
When Wildborn Marauder assaults, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)

Target creature you control gets +1/+1 until end of turn. It deals damage equal to its power to target creature you don't control.
Madness {3}{G} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Qi-Long Shrine enters tapped.
{T}: Add {U} or {R}.
{U/R}, {T}, Sacrifice Qi-Long Shrine: Put a +1/+1 counter on target creature you control. Activate only as a sorcery.

Adorned — Daelish Hopeful has first strike as long as it's equipped and/or enchanted.

As long as it's your turn, planeswalkers you control are X/X creatures with indestructible that are still planeswalkers, where X is the number of loyalty counters on them.
Prevent all damage that would be dealt to planeswalkers you control during your turn.

Reckless Rage deals 4 damage to target creature you don't control and 2 damage to target creature you control.

{8}: Exile target nonbasic permanent. Its controller gains life equal to its mana value.

Artifacts and lands enter tapped.