msem-instigator

Prowess
Whenever Dragon's Eye Spiritualist attacks, the next spell you cast this turn costs {1} less to cast.

Dragon's Ire deals 1 damage to any target.
Inscribed creature gets +2/+2.
Inscribe {2}{R} ({2}{R}: Exile this card from your hand inscribed on a creature you control. Whenever that creature attacks, its controller may cast a copy of the inscribed card without paying its mana cost. Inscribe only as a sorcery.)

As an additional cost to cast this spell, discard a card.
Draw two cards and create a Treasure token.

Menace
Whenever Dragon's Twisted Shadow attacks and isn't blocked, it gets +4/+0 until end of turn.

Dragon's Wrath deals 5 damage to target creature or planeswalker and 2 damage to that permanent's controller.

Equipped creature gets +2/+0.
Equipped creature has first strike as long as it's attacking.
Equip {3}

{2}: Dragonfire Longboat gets +1/+0 until end of turn.
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.)

{T}: Add {C}.
{T}: Target land you control becomes the basic land type of your choice until end of turn.

Harmony — Add one mana of any color.
{1}, {T}: Harmonize. Then sacrifice Dragonglass Harp. (To harmonize, trigger up to one harmony of a permanent you control.)
When Dragonglass Harp is put into a graveyard from the battlefield, draw a card.

Target creature gets +1/+3 and gains hexproof until end of turn. (Then exile this card. You may cast the creature later from exile.)

Flash
When Dragonwall Samurai enters, prevent all combat damage target creature would deal this turn.

Exile target creature with power 3 or less. You gain 3 life.

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Drake Youngling enters, draw a card.

Flying
Ride {3}{U} ({3}{U}: Transform this and attach it to target creature you control without a Steed. Ride only as a sorcery.)

Drakon Nightshade can't block.
When Drakon Nightshade dies, scry 1.

Search your library for a basic land card and put that card onto the battlefield tapped, then shuffle.
Create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)

Prowess
At the beginning of combat on your turn, if a permanent you controlled left the battlefield this turn, target creature can't block this turn.

Target creature gets -2/-1 until end of turn. When it dies this turn, its controller loses 5 life.

{1}, Sacrifice another creature: Put a +1/+1 counter on Dread Cabalist and on up to one target legendary creature. Activate only as a sorcery.

When Dread Elk dies, put a +1/+1 counter on target creature you control. If that creature is a Zombie, put two +1/+1 counters on it instead.
Foreshadow {5}{B} (You may cast this spell for its foreshadow cost. If you do, also trigger its “dies” abilities when it enters.)

Put target attacking or blocking creature on the bottom of its owner's library.

Deathtouch
Whenever Dreadful Gorgon attacks, target attacking creature with lesser power gains deathtouch until end of turn.

When this creature enters, you may sacrifice a creature. If you do, you draw a card and you lose 1 life.
Arise {2}{B} ({2}{B}, Exile this from your graveyard as a sorcery: Create a black token copy of it that's also a Zombie and can't block.)

Flying
When Dreadstone Watcher dies, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Menace
Crew 3 (Tap any number of creatures you control with total power 3 or greater: This Vehicle becomes an artifact creature until end of turn.)