msem-instigator

Flying
When Aven Strategist enters, return up to one target creature to its owner's hand.

Equipped creature gets +0/+2.
Equip {0}

Shock Blast deals X damage to target creature, where X is the number of instant and sorcery cards in your graveyard.

When The Lonely Prophet enters, exile a card you own from outside the game face down.
Whenever The Lonely Prophet deals combat damage, put the exiled card into your hand.

Haste
Whenever Herald of the Humble deals combat damage to a player, that player reveals the top card of their library. If it's a nonland card with mana value 3 or less, they may cast it without paying its mana cost.

Whenever you draw a card except during your draw step, you gain 1 life.
{5}{U}: Draw a card.

X target creatures can't block this turn.
Fuse (You may cast one or both halves of this card from your hand.)

Flying
Once during each of your turns, for each creature you control, you may activate one of that creature's activated abilities with {T} in its cost without paying {T} and as though that creature had haste.

Return up to two target cards from your graveyard to your hand. Put Shared Reminiscence on the bottom of its owner's library.

Target player chooses a creature they control, then returns all other creatures they control to their owners' hands.

Whenever you cast a creature spell, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
Whenever you sacrifice an Idol, draw a card.

Whenever Ferris, the Sapphire Storm or another creature you control enters, each opponent mills X cards, where X is that creature's power.

Whenever you gain life, put a +1/+1 counter on Wayfaring Pilgrim.

Flying
Whenever a Harpy you control becomes the target of a spell, scry 1.

If an opponent controls three or more attacking creatures, you may cast this spell as though it had flash.
Firewall Trap deals 5 damage to target creature. When that creature dies this turn, Firewall Trap deals damage equal to that creature's power to another target creature.

Target creature gains indestructible until end of turn.
Fuse (You may cast one or both halves of this card from your hand.)

Creature tokens you control get +1/+0.

Infernal Flames deals 3 damage to target player or planeswalker.
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.)

Tap up to two target creatures. Germinate. (Put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)

Whenever a creature token you control enters, put a +1/+1 counter on target creature you control.

Creatures you control have “{T}: Add {C} or one mana of any of this creature's colors.”
Attain {5}{G} ({5}{G}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

Exile the top five cards of your library. You may put a creature card from among them with mana value 2 or less onto the battlefield.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I, II — Exile up to one target creature you control. At the beginning of your next end step, return it to the battlefield.
III — Until end of turn, if a creature entering the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
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You may sacrifice three Treasures rather than pay this spell's mana cost.
Flying, trample, haste

Destroy all nontoken creatures.