msem-instigator

Gild-Cloak Strider can't be blocked by creatures with greater power.
{1}{W/U}: Return Gild-Cloak Strider to its owner's hand.

{T}: Add {G}. If you control an attacking creature, add one mana of any color instead.

Slippery Capuchin can't be blocked.
Whenever Slippery Capuchin becomes the target of a spell or ability, you may change the target of that spell or ability.

[+1]: Scry 1. Untap up to one target creature.
[–2]: Mill a card for each card type among permanents you control, then you may return a land card and/or a nonland card milled this way to their owner's hand.
[–6]: Until end of turn, you may cast spells from your hand and graveyard without paying their mana costs. If a card would be put into your graveyard from anywhere this turn, exile it instead.

Shuffle any number of cards from your graveyard into your library.
Scry 1, then draw a card.

Defender, deathtouch
Homestead Watcher gets +2/+0 and can attack as though it didn't have defender as long as you control another creature with defender.

Flying
Lands you control have “{T}: Add one mana of any color.”
As long as you control seven or more lands, creatures you control have trample, haste, and hexproof.

At the beginning of combat on your turn, gain control of another target permanent until end of turn. Untap that permanent. It gains haste until end of turn.
Fleeting {2}{R}{R} (You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)

Whenever Nightly Herald attacks, it deals damage to the defending player equal to the number of Wolves and Werewolves you control.

Poisonous 1 (Whenever this creature deals combat damage to a player, that player gets a poison counter. A player with ten or more poison counters loses the game.)
At the beginning of your upkeep, if an opponent is poisoned, you draw a card, you lose 1 life, and you get a poison counter.

Target opponent sacrifices a creature.
Rerun (If you cast this from your hand, exile it as it resolves. Whenever a creature you control dies, you may cast this card from exile without paying its mana cost.)

Choose one—
• Counter target spell.
• Exile two target permanents you control, then return them to the battlefield under your control.

Ravenous Grue enters with a menace counter on it.
{5}{B}{B}, Remove a menace counter from Ravenous Grue: Destroy target creature.

Whenever a nontoken Satrapy you control enters, create a token that's a copy of it, except it's a 1/1 blue Spirit creature in addition to its other types.
Tap seven untapped Satrapies you control: Exile cards from the top of your library until you exile a nonland card. You may cast that card without paying its mana cost.

{1}, {T}: Draw a card, then exile a card from your hand face down until Cluttered Study leaves the battlefield. (It returns to your hand.)
{3}, {T}: Shuffle Cluttered Study into its owner's library.

Target player mills two cards. You draw a card and you lose 1 life.
Leitmotif (If you cast this spell from your hand, exile it as it resolves. When you next cast a spell that shares a color with this card, you may cast this from exile without paying its mana cost.)

Whenever a permanent you control leaves the battlefield, discard a card, then draw a card.
{1}{R}, Sacrifice a permanent: Mass Pandemonium deals 1 damage to any target.

At the beginning of your upkeep, reveal the top card of your library. Any opponent may have Insurgent Ballads deal damage to them equal to that card's mana value. If a player does, put that card on the bottom of your library. Otherwise, put it into your hand.

When Rotting Sunseeker dies, return target creature card with power 2 or less from your graveyard to your hand.

Mill three cards. You may return a card milled this way to your hand. Each opponent loses 2 life.
Flashback {3}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Enchant creature
When Sporegraft enters, germinate. (Put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)
Enchanted creature has lifelink.

Ferocious — At the beginning of your first main phase, if you control a creature with power 4 or greater, add {R}.

If you would draw a card while your library has no cards in it, you win the game instead.

Improve {G} ({G}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
If a +1/+1 counter would be put on a creature you control, you may put a deathtouch, reach, trample, or vigilance counter on it instead.

Whenever one or more artifacts you control enter, put a +1/+1 counter on Octopus Shiny-Grabber and you gain 1 life.