msem-instigator

Doomsday Horde enters tapped unless it was foreshadowed.
When Doomsday Horde dies, search your library for a card, put it into your hand, then shuffle.
Foreshadow {3}{B}{B}{B} (You may cast this spell for its foreshadow cost. If you do, also trigger its “dies” abilities when it enters.)

Deathtouch
The first instant or sorcery spell with mana value 3 or less you cast each turn has siphon. (Each -1/-1 counter you put on your creatures up to their remaining toughness while casting this pays for {1}.)

Target creature gains flying and gets +1/+0 for each card in your hand until end of turn.
Fuse (You may cast one or both halves of this card from your hand.)

When Depthlight Brute enters, if you control three or more artifacts, each opponent loses 3 life and you gain 3 life.

Put a +1/+1 counter on target creature you control.
Monument {1}{G} (You may cast this transformed from your graveyard for its monument cost. Exile it if it would leave the battlefield or not resolve.)

Flying
Concord — When Archangel of Accord enters, if there are four or more card types among permanents you control, destroy all other creatures.

{1}, Sacrifice Ornate Incense: Draw a card. You gain 1 life.

Deception {1}{B}
When Aguri, Shadow of Doubt enters, target player reveals their hand. You choose a nonland card from it. That player discards that card. You lose 2 life.

Whenever Watch Me Burn enters or another source you control deals noncombat damage, put an ignition counter on Watch Me Burn. Then it deals damage equal to the number of ignition counters on it to each opponent.

Reach
{G}, Sacrifice Fencas: Search your library for a land card, reveal it, put it into your hand, then shuffle.
At the beginning of your end step, if you control seven or more lands, return this card from your graveyard to the battlefield.

Flying
Wither (This deals damage to creatures in the form of -1/-1 counters.)

Return an artifact card from your graveyard to your hand. If you can't, you gain 2 life. Repeat this process for battle, creature, enchantment, land, and planeswalker.
Put Variety of Goods on the bottom of its owner's library.

Foretell {R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
Target attacking creature gets +3/+3 and gains trample until end of turn.

Defender, flying
Whenever you cast a noncreature spell, Dragon Initiate gets +2/+0 and loses defender until end of turn.

{2}: Equipped creature gets +1/+0 until end of turn.
Equip {1}

Players can't gain life.
Whenever a player casts a spell, Rage of the Ravaged deals 1 damage to that player.

Reach
Whenever a lore counter is put on a Saga you control, Kwende Peak Sentry deals 1 damage to each opponent.

{R}, Discard a card: Target creature blocking Scaled Mindreaver gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

Flying, trample, lifelink

Whenever a Survivor you control enters, scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Whenever a creature you control enters, you may have it deal damage equal to its power to another target creature or planeswalker.
I, II, III — Exile the top two cards of your library. You may put a creature card from among them onto the battlefield with a +1/+1 counter on it. It gains haste.
IV — Creatures you control get +3/+3 and gain trample until end of turn.

This spell costs {X} less to cast, where X is the greatest power among creatures you control.
Trample

Althestran Legionnaire gets +1/+1 for each Aura attached to it.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
During each of your turns, you may cast an instant or sorcery spell from your graveyard. If that spell would be put into your graveyard, exile it instead.
Whenever Aurora, Soulweaver attacks, untap any number of target creatures.

Noncreature spells you cast cost {1} more to cast.
Noncreature spells your opponents cast cost {1} more to cast unless that player controls more creatures than you.