msem-instigator

Look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.
Flashback {2}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Vigilance
Whenever Karoa's Vanguard or another Knight you control enters, if an opponent controls more lands than you, you may search your library for a Plains card, reveal it, put it into your hand, then shuffle.

Living Broadcast can't block.
Whenever you cast a spell from exile, you may return Living Broadcast from your graveyard to your hand.

Target creature gets +X/+0 until end of turn, where X is the number of instant and sorcery cards in your graveyard.

Destroy target permanent. Trigger a death knell of any number of permanents you control.

Haste
When Collapsing Star Viper enters, you may tap target permanent with mana value X or less.
At the beginning of your upkeep, return Collapsing Star Viper to its owner's hand.

Whenever Dawn Hill Daybreaker or another creature you control enters, you gain 1 life. If that creature is a Cleric, tap up to one target creature an opponent controls.

Target creature you control deals damage equal to its power to another target creature. You gain 3 life.

Your life total becomes 0. Until an opponent's next turn, you can't lose the game, your opponents can't win the game, and you can't gain life.
Take an extra turn after this one.
Exile Buy Time.

Deathtouch, lifelink
At the beginning of combat on your turn, for each creature your opponents control, you may tap an untapped creature you control. If you do, those creatures fight each other.

Once each turn, when a creature you control becomes tapped, you may untap that creature and tap up to one target creature.

{T}: Add {C}.
{1}, {T}, Sacrifice House of Forgotten Whispers: Draw a card.

Flying
Whenever AOSE Skydrone deals combat damage to a player, draw a card.

Tomb of the Roseblade enters tapped.
{T}: Add {C}.
{X}, {T}, Sacrifice Tomb of the Roseblade: Search your library for an Equipment card with mana value X or less, put it onto the battlefield, then shuffle. Activate only as a sorcery.

Equipped creature has vigilance. (Attacking doesn't cause that creature to tap.)
Equip {1}

Vigilance
When Scion of Storms enters, create a 2/2 white Elemental creature token with flying.
Whenever a Plains you control enters, you may aetherize Scion of Storms. (To aetherize, create a token that's a copy of it, then exile that token.)

The Last Sacred Gate enters tapped.
While you're searching your library, you may play The Last Sacred Gate from your library. (You may only do so during your turn and if you have a land play remaining.)
{T}: Add {C}.

Whenever you cast your first noncreature spell each turn, you may cast a creature spell with lesser mana value from your hand without paying its mana cost.
Whenever you attack with three or more creatures, target instant or sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost.

Choose one —
• Create three X/X colorless Construct artifact creature tokens.
• Create X tokens that are copies of target artifact you control.

Target player sacrifices a creature. Then you gain 3 life if that player doesn't control any creatures.

[+1]: Raidragos, the Vindictive deals 3 damage to target player or planeswalker and 1 damage to you.
[–2]: Until end of turn, creatures you control gain “{R}: This creature gets +1/+0 until end of turn.”
[–8]: You get an emblem with “Whenever you cast an instant or sorcery spell, this emblem deals 4 damage to each opponent.”

Flying
Whenever one or more other creatures die for the first time each turn, journey. (To journey, exile the top card 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.)

Return X target cards with different mana costs from your graveyard to your hand. Exile Eternal Blessings.

Unleash the Dragon deals 1 damage to any target for each spell cast this turn.