msem-instigator

When Ghastly Ferry enters, create a 1/1 white Spirit creature token with flying.
Ghastly Ferry can't be blocked except by Spirits.
Crew 1 (Tap any number of creatures you control with total power 1 or greater: This Ship Vehicle becomes an artifact creature until end of turn.)

Trample
When Ghastly Progenitor enters, each opponent reveals their hand. Choose two nonland cards revealed this way. Their owners discard those cards.

Deathtouch
When Ghastly Scorpion dies, you draw a card and you lose 1 life.

Creatures can't attack you or a planeswalker you control unless their controller pays {2} for each of those creatures.
Creatures can't block Ghastly Scraper unless their controller pays {2} for each of those creatures.

Flash

Flying
When Ghastly Spirit enters, mill four cards, then return a nonland card from your graveyard to your hand.

Until end of turn, target creature you control gains “When this creature dies, return it to the battlefield under your control with a +1/+1 counter on it.”

Destroy target creature or planeswalker. If a planeswalker is destroyed this way, search its owner's graveyard, hand, and library for any number of cards with the same name as that card and exile them. Then that player shuffles.

Creatures you control have deathtouch as long as they're attacking.
[+1]: Target creature you control must be blocked this turn if able.
[–2]: Create two 1/1 white Human creature tokens.
[–X]: Destroy target artifact or enchantment with mana value X and all other permanents with the same name as that permanent.

{T}: Draw a card, then discard a card.
Sacrifice Ghislain, Cryptbreaker: You may cast target creature, instant or sorcery card from your graveyard this turn. If that spell would be put into your graveyard, exile it instead. Activate only during your turn.

{2}, {T}: Prevent all combat damage that would be dealt to and dealt by target creature this turn.

{T}: Add {C}.
{T}, Sacrifice Ghost Quarter: Destroy target land. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.

Ghost Sloop can't be blocked.
Crew 4 (Tap any number of creatures you control with total power 4 or greater: This Vehicle becomes an artifact creature until end of turn.)
Exile a creature card from your graveyard: Ghost Sloop becomes an artifact creature until end of turn.

Flying
Creatures your opponents control get -1/-0.

Exile two target artifacts, creatures, and/or lands you control, then return those cards to the battlefield under your control.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
Whenever Ghostly Hounds mentors a creature, that creature can't be blocked this turn.

({T}: Add {U} or {B}.)
Ghostspore Mire enters tapped.
{1}, {T}: Add {U}{U} or {B}{B}.

Exile each creature you control. Return those cards to the battlefield under their owner's control at the beginning of the next end step.

When Ghoulsaber enters, create a 1/1 white Spirit creature token with flying, then attach Ghoulsaber to it.
Equipped creature gets +2/+2.
Equip {2}

Deathtouch
Whenever Ghul of Forgotten Pasts dies, you may exile it. If you do, return target creature card from a graveyard to the battlefield under your control. You gain life equal to that card's mana value.

Return target creature card with mana value 3 or less from your graveyard to the battlefield. It gains haste until end of turn.
Monument {3}{B}{R} (You may cast this transformed from your graveyard for its monument cost. Exile it if it would leave the battlefield or not resolve.)

Trample

Tribute 1 (As this creature enters, an opponent of your choice may put a +1/+1 counter on it.)
When Giant Dromad enters, if tribute wasn't paid, you may destroy target artifact or enchantment.

Target creature gets +3/+3 until end of turn.

Flying
Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)