msem-instigator

Vigilance
This spell costs {1} less to cast for each +1/+1 counter among creatures you control.

Return up to one target creature card from a graveyard to the battlefield under your control.
Coalesce {9}{B} (You may cast this from your graveyard for {9}{B}. If you do, put it onto the battlefield as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
Indestructible

When Deathless Hunter dies, you may put it on the bottom of its owner's library.

Decay deals damage to creatures in the form of -1/-1 counters.
{B}{G}: Until end of turn, target creature deals damage to creatures in the form of -1/-1 counters. Activate only if Decay is in your graveyard.

Deception can't be blocked.
{1}{U}{B}: Target creature can't be blocked this turn. Activate only if Deception is in your graveyard.

Deep-Sea Terror can't attack unless seven or more cards are in your graveyard.

Defender
Sacrifice two Islands: Deepsea Denizen loses defender until end of turn.

Damage dealt by Deepwater Stinger can't be prevented.

Dekinn, Depths Spirit can't attack or block unless a player has lost 3 or more life this turn.
At the beginning of each player's upkeep, that player may create a Mountain token. If they do, Dekinn deals 3 damage to them.
When Dekinn dies or is put into exile from the battlefield, you may put him into his owner's library third from the top.

When Delugic Surger enters the battlefield, if you control another Elemental, return target instant or sorcery card from your graveyard to your hand.

This spell costs {2} less to cast for each creature that died this turn.
Flying, trample

{1}{B}, Sacrifice another creature: Draw a card and create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
{2}{B}, Sacrifice three Idols: Return Demon of Hubris from your graveyard to the battlefield. Activate only as a sorcery.

Menace
When Depraved Archknight enters the battlefield, each opponent may pay 7 life. For each player that doesn't, you draw seven cards.

Trample
When Depthlight Frontliner enters the battlefield, you may salvage up to one instant card and up to one sorcery card. (Exile those cards from your graveyard until this creature leaves the battlefield. Whenever this creature deals combat damage to a player, put a card it salvaged into your hand.)

Tribute 2 (As this creature enters the battlefield, an opponent of your choice may put two +1/+1 counters on it.)
At the beginning of your upkeep you lose life equal to the number of +1/+1 counters on Descendant of Caaseb.

Prowess
At the beginning of combat on each of your turns, you may draw a card. If you do, discard a card.

Desert Wurms can't be blocked by creatures with flying.
When Desert Wurms enters the battlefield, create two 6/6 red Wurm creature tokens with “This creature can't be blocked by creatures with flying.”
When Desert Wurms is put into a graveyard from anywhere, shuffle it into its owner's library.

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

Determined Chevalier has vigilance as long as it's embattled. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

Haste (This creature can attack and {T} as soon as it comes under your control.)
Whenever a creature you control attacks, each opponent loses 1 life.

Flying
Div of the Endless Thought has all activated and triggered abilities of all other permanents on the battlefield.

Trample

Flying, first strike, haste
Whenever Doombringer Dragon attacks, you may sacrifice another creature. If you do, Doombringer Dragon gets +3/+0 until end of turn.

When Doomstep Giant enters the battlefield, each player sacrifices a land.