msem-instigator

Skysworn Aspirant has flying as long as it's embattled. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)

Flying
Stormcloud Drake gets +1/+0 for each instant and sorcery card in your graveyard.
Whenever Stormcloud Drake attacks, tap target creature defending player controls.

Counter target spell. If that spell is countered this way, until the end of your next turn the next spell you cast that shares a type with it costs {X} less to cast, where X is the countered spell's mana value.

Menace
Whenever Coirchanh deals combat damage to a player, return up to one target creature card with toughness 4 or greater from your graveyard to the battlefield with a finality counter on it.
{1}{G}: This creature gets +0/+2 until end of turn.

Reach
Stonebark Incinerator gets +2/+0 and has trample as long as you control a Dwarf.
Stonebark Incinerator gets +0/+2 and has vigilance as long as you control a Elf.

Journey three times. (Exile the top three cards of your library face up. Whenever a creature you control deals combat damage to an opponent, put a journeyed card you own into your hand.)

Search your library for a Demon card or a black card with mana value 6 or greater, reveal it, put that card in your hand, then shuffle.

You may look at the top card of your library any time.
You may play lands from your graveyard and the top of your library.

Target player mills five cards.
Draw a card.

Destroy target enchantment. If it's a Curse, you gain 3 life.

Creatures you control without counters on them get +2/+2.
Whenever you attack, target attacking creature gains trample until end of turn.
At the beginning of your end step, sacrifice this enchantment unless you put two -1/-1 counters on a creature you control.

Flying, vigilance
At the beginning of your upkeep, if you control four or more Plains, put a +1/+1 counter on each other creature you control.

Menace

({T}: Add {W} or {B}.)
Whenever Arctic Mine becomes tapped, you lose 1 life unless you control two or more basic lands.

At the beginning of your end step, aetherize target permanent you control. (To aetherize, create a token that's a copy of it, then exile that token.)

Mark (Whenever this creature attacks, mark target creature until end of turn.)
Whenever a marked creature dies, you lose 1 life and you draw a card.

Move any number of +1/+1 counters from creatures you control onto target creature you control, then that creature deals damage equal to its power to target creature you don't control.

(Activate each ability only once as a sorcery. You gain the realm's favor after activating them all.)
{W}: Put a first strike counter on target creature.
{1}{W}: Invigorate 2. (Choose a creature with the least power among creatures you control and put two +1/+1 counters on it.)
{2}{W}: Create two 1/1 white Soldier creature tokens.
Creatures you control with counters on them have flying and lifelink.

Pristine Delta enters tapped.
{T}: Add {W} or {U}.
{2}{W}{U}, {T}, Sacrifice Pristine Delta: Draw a card.

When Weald Wanderer enters, you gain 3 life and each opponent loses 2 life.
{1}, Pay 1 life: Shuffle Weald Wanderer into its owner's library. If you do, draw a card.

Equipped creature gets +1/+0 and has menace.
Equip {3}

Spirited (When this enters, you may activate one of its activated abilities without paying its cost.)
{2}, Sacrifice Imperial Silks: Draw a card.
{2}, Sacrifice Imperial Silks: You gain 3 life.

Fiery Erasure deals 3 damage to target creature or planeswalker. If that permanent would die this turn, exile it instead.

Flash
When Elusive Illusionist enters, target attacking creature gets -2/-0 until end of turn.

{5}{U}{U}: Thassa's Tidebringer can't be blocked this turn. This ability costs {1} less to activate for each creature you control with a counter on it.