msem-instigator

First strike (This creature deals combat damage before creatures without first strike.)

[+1]: Add two mana of any one color.
[0]: Put two +1/+1 counters on target creature you control. Then put your choice of a reach, vigilance, or trample counter on it. If you have an insight counter, you may put all of those counters on that creature instead.
[0]: You get an insight counter.
[–2]: Destroy target noncreature, nonland permanent.

Trample, haste
When Dashing Rager enters, attach all Equipment on the battlefield to it. (Control of the Equipment doesn't change.)
At the beginning of the end step, sacrifice Dashing Rager.

When Data Smuggler enters, if an opponent is cursed, exile the top card of your library. You may play that card until the end of your next turn.

Improve {1}{W} ({1}{W}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
Knights you control have double strike as long as they're attacking.

Dawn Siege deals 4 damage to target creature and 2 damage to each other creature.

Lifelink

When Dawson's Enforcer enters, draw a card if you sacrificed a permanent or discarded a card this turn.

Choose one —
• Destroy target noncreature, nonland permanent.
• Put a -1/-1 counter on each creature.

Flying, lifelink
When Daystrider Pegasus enters, exile another target non-Pegasus permanent you control, then return it to the battlefield under its owner's control.

Flash (You may cast this spell any time you could cast an instant.)
When Dazzling Voidmage enters, you may return target attacking creature to its owner's hand.

Equipped creature gets +4/+2.
Equip—Sacrifice a creature. (Sacrifice a creature: Attach to target creature you control. Equip only as a sorcery.)

Engage (This creature must be blocked each combat if able.)
Whenever Death Pits Gladiator perseveres, profit. (A creature perseveres when it survives damage. To profit, create a colorless Gold artifact token with “Sacrifice this artifact: Add one mana of any color.”)

Destroy four target creatures.

When Death's Sentry enters, if a creature died this turn, create a 2/2 black Zombie creature token.

Flying, deathtouch

When Deathless Disciple dies, if it's not a token, create a token that's a copy of it, except it has no mana cost.
Revive {6}{B} ({6}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

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

{T}: Put a flood counter on Decanter of Endless Rivers. Add {U} for each flood counter on it.

Primal {B}{B} (During your turn, you may cast this spell for {B}{B} instead of playing a land.)
Search your library for a card and put that card into your hand, then shuffle. Exile Deceitful Tutor.

Indestructible (Damage and effects that say “destroy” don't destroy this creature.)
Whenever Declare, the Mother Bear deals combat damage to a player, put a +1/+1 counter on it.

As an additional cost to cast Deepmire Abomination, reappropriate or pay {2}. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)
Menace

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

Destroy target creature or planeswalker.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

As long as it's your turn, Defect 37 is a 7/7 Vehicle artifact with crew 2.
[+1]: Creatures and Vehicles you control get +1/+1 until end of turn.
[–1]: Put target permanent into its owner's library, third from the top. If Defect 37 is on the battlefield, return her to her owner's hand.
[–6]: Until end of turn, each noncreature, nonland permanent you control becomes a creature in addition to its other types with base power and toughness each equal to their mana value or base power, whichever is greater.