msem-instigator

Whenever you cast a spell, harmonize. (Trigger up to one harmony of a permanent you control.)
Harmony — Target permanent you control becomes a 2/2 creature with flying in addition to its other types until end of turn.

Supply Run costs {2} less to cast if a creature you controlled attacked this turn and wasn't blocked.
Draw two cards.

Target player draws X cards.

Choose up to one nonland permanent. Return the rest to their owners' hands.

At the beginning of your end step, put a flood counter on Swelling Sea, then return each nonland permanent with mana value less than or equal to the number of flood counters on Swelling Sea to its owner's hand.

Counter target spell. Create a Treasure token. (It's an artifact with “{T}, Sacrifice this artifact: Add one mana of any color.”)

At the beginning of your upkeep, you may sacrifice Sylph Spawning. If you do, create three 1/1 blue Nymph creature tokens with flying.

(As this Discovery enters and after your draw step, add a progress counter. Stop after you've discovered.)
Archive 6 (As this enters, shuffle the top six cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Draw a card from each of your libraries.
discover — When you draw the last card from the archived library, create a 4/4 blue Sphinx Wizard creature token with flying.

Whenever you cast a blue spell, each opponent mills a card.

Counter target spell unless its controller pays {X}. If that spell is countered this way, exile it instead of putting it into its owner's graveyard.

Look at target player's hand. Draw two cards, then discard a card.

Enchant creature
You control enchanted creature.
At the beginning of your upkeep, enchanted creature's owner may have you draw three cards. If they do, sacrifice Take For Ransom.

Exile target nonland permanent you control, then return that card to the battlefield under your control.
Leitmotif (If you cast this spell from your hand, exile it as it resolves. When you next cast a spell that shares a color with this card, you may cast this from exile without paying its mana cost.)

Draw three cards.
Skip your next turn. If it's your turn, end the turn.

Target creature gets +1/+2 and gains flying until end of turn.
Agonize (You may cast this card from your graveyard by putting a -1/-1 counter on a creature you control in addition to paying its other costs. Then exile this card.)

Draw two cards.

Bleed—{B}, Pay 2 life. (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
Draw two cards, then discard a card.

Prismatic — Whenever you cast a multicolored spell, you may pay {1}. If you do, exile target nonland permanent, then return it to the battlefield tapped under its owner's control.

Draw three cards, then discard a card unless you exile two cards from your graveyard.

Enchant creature
Whenever enchanted creature deals combat damage to a player, draw a card.

{U}, Exile a card from your hand or graveyard that doesn't share a type with a card exiled by Tea of Augury: Draw a card.

Exile target permanent, then return that card to the battlefield under its owner's control.
Draw a card.

You may cast Elemental spells as though they had flash this turn.
Whenever you cast an Elemental spell this turn, draw a card.

Look at the top three cards of your library. Put one of those cards into your hand, one on top of your library, and one on the bottom of your library.

Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Take an extra turn after this one. Exile Temporal Aria.