msem-instigator

{3}{G}: Search your library and/or graveyard for an Aura card, reveal it, and put it into your hand. If you search your library this way, shuffle.
{1}{U}: Untap target creature.

Draw two cards.
Cycling {2} ({2}, Discard this card: Draw a card.)

Choose target creature you control. Double its power and toughness until end of turn. That creature deals X damage divided as you choose among any number of target creatures and/or planeswalkers your opponents control, where X is its power.

Create a 2/2 black Zombie creature token.
Tether (Then if you cast this from your hand, you may exile it tethered to a creature you control. When it dies, you may cast this from exile without paying its mana cost.)

Stampede — Whenever Cloud's Roar Avenger and a creature with greater power attack, tap up to one target creature.

Cloudcover Heights enters the battlefield tapped unless you control a Forest.
{T}: Add {R} or {W}.

Flying
When Cloudheath Sentinel enters the battlefield, return target artifact card with mana value 2 or less from your graveyard to the battlefield.

Embellish {2}{U} (If you cast this spell for {2}{U}, create a 1/1 blue Thopter artifact creature token with flying when it enters the battlefield.)
{T}: Target player mills a card. If you control three or more artifacts, that player mills three cards instead.

When Conduit of the Conflux enters the battlefield, scry 2.
{T}: Add one mana of any color.

When Conflux Ravager enters the battlefield, destroy target nonland permanent an opponent controls.
Cycling {2} ({2}, Discard this card: Draw a card.)

Create three 1/1 white Soldier creature tokens. Scry 3.

Enchant creature
Enchanted creature gets +2/+1 and has “Whenever this creature attacks, target creature an opponent controls can't block this turn.”

Menace
Whenever you cast an instant or sorcery spell, create a 2/2 black Zombie creature token. This ability triggers only once each turn.

Cosmic Catastrophe deals 6 damage to target creature or planeswalker. If you control a creature with power greater than its base power, Cosmic Catastrophe deals 3 damage to each opponent.

Crumbling Necropolis enters the battlefield tapped.
{T}: Add {U}, {B}, or {R}.

Cryptic Reef enters the battlefield tapped.
{T}: Add {G} or {U}.
{2}{G}{U}, {T}, Sacrifice Cryptic Reef: Draw a card.

Flying
Whenever one or more counters are put on a creature you control, Curio Siren gets +1/+0 until end of turn.

Menace
When Dagger-Thrash Marauders enters the battlefield, you may have it consume. If you do, put a +1/+1 counter on it and it gains haste until end of turn. (To consume, sacrifice another creature or exile a creature card from your graveyard.)

Flying
Heroic — Whenever you cast a spell that targets Dawnbringer Vanguard, tap target creature an opponent controls.

Lifelink

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

Deeplife Cavern enters the battlefield tapped unless you control a Forest.
{T}: Add {U} or {B}.

Whenever you scry, tap target creature an opponent controls.
{2}{W}{U}: Scry 1. You gain 1 life.

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.)

Create a 4/4 black Demon creature token with flying. You lose 3 life for each Demon you control.
Tether (Then if you cast this from your hand, you may exile it tethered to a creature you control. When it dies, you may cast this from exile without paying its mana cost.)