msem-instigator

Deepdrinker's Domain enters tapped.
{T}: Add {U}.

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

Deft Goldsnatch can't be blocked.

Enchant non-Camel creature
When Dehydrate enters, draw a card.
Enchanted creature gets -1/-0.

This spell costs {1} less to cast for each time you catalyzed this turn.
Counter target spell unless its controller pays {X}.

Whenever Deluge Crab perseveres, target opponent mills three cards. (A creature perseveres when it survives damage.)

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
Each creature you control with a counter on it has ward {2}. (If a creature has multiple instances of ward, each triggers separately.)

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

Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)
You may sacrifice any number of artifacts. If you do, draw that many cards.

When Demented Brainiac enters and at the beginning of your upkeep, each opponent mills two cards.
{U}, Sacrifice Demented Brainiac: Exile each opponent's graveyard. Until end of turn, you may cast instant and sorcery spells exiled this way, and you may spend mana as though it were mana of any color to cast them.

When Demonqueller Mage enters, gain control of target creature with power 2 or less until Demonqueller Mage leaves the battlefield.

Tap up to two target creatures.
Cycling {1}{U} ({1}{U}, Discard this card: Draw a card.)
When you cycle Denied Attempt, you may tap target creature.

Counter target spell unless its controller pays {X}. If they do, you draw half X cards, rounded down.

Create three 1/1 colorless Servo artifact creature tokens.

Hexproof
Rapport — Whenever Depths Stalker and at least one other creature you control become tapped, Depths Stalker gets +1/+0 until end of turn and can't be blocked this turn.

Enchant creature
Enchanted creature gets -3/-0.
Spells that target enchanted creature cost {1} more to cast.

Counter target nonenchantment spell.

Counter target spell unless its controller pays {3}. If you own a foretold card in exile, counter that spell unless its controller pays {6} instead.

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

Flying
Whenever you cast your second spell each turn, put a +1/+1 counter on Detached Specters.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
When Determined Koi has three or more +1/+1 counters on it, remove them all and transform it.

Flying
At the beginning of your upkeep, for each seven cards in your graveyard, Devotee of Winds explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this creature, then put the card back or put it into your graveyard.)

When Dewdrop Oracle enters, reveal the top four cards of your library. You may put a noncreature card from among them into your hand. Put the rest on the bottom of your library in any order.

Draw a card for each Wizard you control.
Wizardcycling {2}{U} ({2}{U}, Discard this card: Search your library for a Wizard card, reveal it, and put it into your hand, then shuffle.)

Counter target spell unless its controller pays {2} plus an additional {2} for each card named Diffuse in your graveyard.