msem-instigator

Target creature gets +3/+0 and gains lifelink and indestructible until end of turn.

Regenerate target creature. (The next time that creature would be destroyed this turn, it isn't. Instead tap it.)

Mill four cards. You may put up to two cards from among the milled cards into your hand. Each player loses 2 life.

Lifelink

Menace
Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.)
Gilded Sell-Sword gets +2/+0 as long as you're in a renaissance.

Destroy target non-Gorgon creature. Scry 1.

Target opponent sacrifices a creature. Put a +1/+1 counter on up to one target creature you control.

Gloam Gullet gets +1/+1 and has menace as long as you own a land card in exile or in your graveyard.

Gloaming Smokeweaver has deathtouch as long as there is a creature card in your graveyard.

When Globule of Agony enters or leaves the battlefield, target player loses 1 life.
{2/B}, {T}, Sacrifice Globule of Agony: Draw a card.

(Add a quest counter as this enters. Sacrifice after 3.)
Once each turn, when a player discards a card, you may add a quest counter.
Each opponent loses X life and you gain X life, where X is the number of quest counters on Gloomhollow Expedition.
Choose up to two target creature cards in graveyards with total mana value 3 or less. Put those cards onto the battlefield under your control.

Flying, lifelink
Menagerie — When Gloomhollow Fluffpuff enters, if there are five or more creature types among creatures you control, you may search your library for a card named Gloomhollow Fluffpuff, reveal it, put it into your hand, then shuffle.

Pressure {2}{B}{B} (You may cast this spell for its pressure cost if seven or more cards are in your graveyard.)
When Gloomtide Whelk enters, all other creatures get -4/-4 until end of turn.

Put target creature card from a graveyard onto the battlefield under your control. If that card was put into that graveyard this turn, it enters with an additional +1/+1 counter on it.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
Cycling {B} ({B}, Discard this card: Draw a card.)

When Glymna Blackrune enters, exile target player's graveyard.
During each of your turns, you may cast a creature card exiled with Glymna Blackrune.

When Gnuge-District Hoarder enters, each opponent loses 1 life. You gain life equal to the life lost this way.
Paranoia {1}{B} (You may cast this spell for its paranoia cost when a permanent you control leaves the battlefield.)

Target player discards two cards. Then exile that player's graveyard.

Enchant player
At the beginning of enchanted player's end step, if they cast a spell this turn, they lose 1 life.

Pressure {1}{B} (You may cast this spell for its pressure cost if seven or more cards are in your graveyard.)
Destroy target creature.

Each opponent sacrifices a creature. Whenever one or more players lose life this turn, repeat that process.

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
Whenever Goldtooth Slasher attacks, you may sacrifice an artifact or creature. If you do, Goldtooth Slasher gets +2/+0 and gains lifelink until end of turn.

This spell costs {1} less to cast for each card put into your graveyard from anywhere this turn.
Target creature gets -4/-4 until end of turn.

When Goremound enters, target creature you don't control gets -3/-3 until end of turn. All other creatures you don't control with the same name as that creature get -1/-1 until end of turn.
Evoke {1}{B} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)