msem-instigator

At the beginning of your first main phase, add {R}.
Whenever a colossal ability puts one or more counters on a creature you control, Draconic Symphony deals 2 damage to any target.

Enchant creature
Enchanted creature has flying and “{R}: This creature gets +1/+0 until end of turn.”

Ferocious — If you control a creature with power 4 or greater, you may cast Dragon Grip as though it had flash. (You may cast it any time you could cast an instant.)
Enchant creature
Enchanted creature gets +2/+0 and has first strike.

Dragon Queen's Den enters tapped.
{T}: Add {U}.
{U}, {T}: Scry 1. Activate only as a sorcery and only if you control a blue creature.

Haste
{T}: Dragonfire Sniper deals 1 damage to target creature or planeswalker and 1 damage to that permanent's controller.

When Dragonheart Seer dies, you may exile it. If you do, return up to two target instant and/or sorcery cards from your graveyard to your hand.

Defender
A deck can have any number of cards named Dragonwall Fragment.
At the beginning of your upkeep, if you control twenty or more creatures named Dragonwall Fragment, you win the game.

{T}: Add {C}.
Tap an untapped creature you control: Dragonwall Gates becomes a 0/4 Wall artifact creature with defender until end of turn. It's still a land.

{T}: Add {C}.
{T}, Reappropriate: Add {G} or {U}. (Exile exactly two cards from your hand and/or graveyard.)

Harmony — Draw a card, then discard a card.
Whenever Dramatic Artist attacks, harmonize. (Trigger up to one harmony of one permanent you control.)

Pressure {G} (You may cast this spell for its pressure cost if seven or more cards are in your graveyard.)
Return target card from your graveyard to your hand. Exile Drawn to the Light.

Flying
When Dreadworld Demon enters, each opponent may have you draw a card. Each player who doesn't loses 3 life. You gain life equal to the life lost this way.

Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.)
{0}: If a player has fifteen or fewer cards in their library, unlock Dreamcast Relic. If the revealed card is blue, put it into your hand. Otherwise, put it on top of your library.

Protection from Spirits
At the beginning of each end step, if a card was put into exile or a graveyard from anywhere this turn, draw a card.

Flying
Foresight — Whenever you draw your second card each turn, put a +1/+1 counter on Dreammender Sphinx.
Cycling {2} ({2}, Discard this card: Draw a card.)

Flash
When Dreamnapper enters, another target creature phases out until Dreamnapper leaves the battlefield. (Treat it and anything attached to it as though they don't exist as long as it's phased out.)

({T}: Add {W} or {B}.)
Dreary Township enters tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

Each player mills five cards.
Coalesce {4}{U}{B} (You may cast this from your graveyard for {4}{U}{B}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)
Drink Thoughts Like Oil can't be blocked.

Enchant creature
Whenever enchanted creature becomes tapped, return it and Driven to Distraction to their owner's hands.

Menace, haste
Other Centaurs you control get +1/+0.

When Driver of Hordes enters, create a tapped 2/2 black Zombie creature token.
Unearth {3}{B} ({3}{B}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the end step or if it would leave the battlefield. Unearth only as a sorcery.)

This spell costs {X} less to cast, where X is the number of card types among cards in your graveyard.
Surveil 3, then you draw three cards. You lose 3 life.

Flying
Whenever you cast a spell during an opponent's turn, Drosera and Nerium deals 1 damage to each opponent.
As long as Drosera and Nerium is tapped, you may cast spells as though they had flash.

{T}: Add {C}.
{T}, Reappropriate: Add {R} or {W}. (Exile exactly two cards from your hand and/or graveyard.)

Flying
Whenever a creature you control dies, put a +1/+1 counter on Drove of the Lost.
{1}, Sacrifice a creature: Each opponent loses 1 life. Gain 1 life.