msem-instigator

Trample
When Wasteland Ravagers enters, you may sacrifice a land or exile a land card from your graveyard. If you do, creatures you control get +1/+0 and gain haste until end of turn.

Colossal 2—{3}{R} (You may cast this for its colossal cost to have it enter with two +1/+1 counters; or pay {3}{R} as a sorcery: Put two +1/+1 counters on it if it has none.)
When Emberhound's colossal ability puts one or more counters on it, target creature can't block this turn.

Flying
When Sha Long enters, each player chooses an artifact they control, then sacrifices the rest. If they don't control an artifact, they may return an artifact card from their graveyard to the battlefield. Repeat this process for creatures, enchantments, and planeswalkers.

Double strike

Untap target creature. It gets +1/+1 for each token you control until end of turn.

(Add a quest counter as this enters. Sacrifice after 6.)
Whenever you cast a permanent spell, add a quest counter.
1, 2, 3, 4, 5 — Choose a color that hasn't been chosen. Search your library for a permanent card that's exactly that color, reveal it, and put it into your hand. Then shuffle.
6 — Exile Collect the World Stones. For the rest of the game, you may spend mana as though it were mana of any color.
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Target creature gets +3/+3 and gains winnow until end of turn. (Damage dealt to it also causes its controller to lose that much life.)

{T}: Add {G}.
{T}: Add one mana of any color. Activate only if you control another Dryad.

Enchant creature
When Crown of Spores enters, germinate. (Put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)
Enchanted creature gets +2/+2.

When Journey through Odaya enters, draw a card, then choose a creature card name.
Creatures you control with the chosen name can't be blocked.

At the beginning of each end step, put a +1/+1 on Quickstep Ranger for each +1/+1
counter you've put on creatures under your control this turn.
Surpass {5}{G} ({5}{G}: Transform this creature. This costs {1} less to activate for each counter
on it. Activate only as a sorcery.)

Menace
When Vicious Stinger dies, each opponent loses 2 life. You gain life equal to the life lost this way.

Target creature you control gains protection from the color of your choice until end of turn. (Then exile this card. You may cast the creature later from exile.)

When Radiant Rebuker enters, exile target nonland permanent an opponent controls until Radiant Rebuker leaves the battlefield.

{3}{B}, Discard a card: Each opponent loses 2 life and you gain 2 life.
At the beginning of your upkeep, if there are five or more creature types among cards in your graveyard, you lose 1 life and draw a card.

This spell costs {3} less to cast if it targets a card in your graveyard that was put there from anywhere this turn.
Exile target instant or sorcery card in your graveyard with mana value X or less. You may cast a copy of that card without paying its mana cost.

[+2]: Up to one target creature gets -1/-1 until your next turn. Tap it. You may remove all counters from it.
[–2]: Destroy target creature with no counters on it.
[–10]: Each opponent's life total becomes equal to the number of creatures they control.

Gloomtide Gulf enters tapped.
{T}: Add {U} or {B}.
{1}, {T}: Add one mana of any color.

Protection from noncreatures and from creatures with power 3 or less
Players dealt damage by Absurdity also get that many poison counters. (A player with ten or more poison counters loses the game.)
When Absurdity is put into a graveyard from anywhere, shuffle it into its owner's library.

As Warmonger Contraption enters, choose a creature type.
Warmonger Contraption is the chosen type in addition to its other types.
Warmonger Contraption's power and toughness are each equal to the number of creatures of the chosen type you control.

Siphon (Each -1/-1 counter you put on your creatures up to their remaining toughness while casting this pays for {1}.)
You gain X life and draw X cards, where X is the number of creatures that died this turn.

Target player sacrifices a creature.
Create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)

Each opponent can't draw more than one card each turn.
Cycling {W} ({W}, Discard this card: Draw a card.)
When you cycle Sphinx's Authority, you gain 1 life.

Exile up to three target instant and/or sorcery cards from your graveyard. Until end of turn, you may cast cards exiled this way.
Exile Speedreading.

Gain control of target nonland permanent an opponent controls. Its owner reveals cards from the top of their library until they reveal a card that shares a type with that permanent, then puts it onto the battlefield and shuffles.