msem-instigator

Enchant creature or enchantment
Enchanted permanent doesn't untap during its controller's untap step.
Enchanted permanent can't have counters put on it.

Whenever a permanent you control leaves the battlefield, if it had counters on it, you may put those counters on Stage Magician.
At the beginning of your end step, you may move any number of counters from Stage Magician onto target permanent you control.

Bloodprice {2}{U} (You may cast this card by sacrificing a creature and paying its bloodprice.)

Until end of turn, creatures and artifacts you control gain “{T}: Tap target permanent.”

Whenever you draw a card, put a dream counter on Stargazing.
Remove seven dream counters from Stargazing and exile it: Shuffle your hand and graveyard into your library, then draw seven cards.

{T}: Add {C}.
{T}, Pay 1 life: Add {U}.
{U}, {T}: Add one mana of any color.

Whenever Starlight Emissary harnesses a spell, draw a card.

Draw two cards. If you have no cards in hand and there are no cards in your graveyard, draw seven cards instead.

This spell costs {2} less to cast if you cast it during your main phase.
Tap up to two target creatures. Put a stun counter on each of those creatures.

Whenever Stealer of Secrets deals combat damage to a player, draw a card.

(Transform this if it's not attached to a creature. Pay {2}{U} as a sorcery to unattach it.)
Enchant creature you control
Steed of the Loch's rider gets +2/+1.
Whenever Steed of the Loch's rider attacks, you may tap target creature an opponent controls.

Steel Hunter can't attack unless you control three or more other artifacts.

Flying
Embellish {4}{U} (If you cast this spell for {4}{U}, create a 1/1 blue Thopter artifact creature token with flying when it enters.)

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

Enchant creature
When Sticky Fingers enters, draw a card.
Enchanted creature gets +2/+0 and can't be blocked.

Counter target noncreature spell. Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

When Stillmarsh Brinecatcher enters, return another target nonland permanent to its owner's hand.
At the beginning of your end step, if you control a permanent with mana value 5 or greater, you may sacrifice Stillmarsh Brinecatcher. If you do, draw a card and create a 3/2 colorless Horror creature token.

Stoic Djinn has flying as long as it has a counter on it.

{T}: Look at the top two cards of your library, then put them back in any order.

Take an extra turn after this one. At the beginning of that turn's upkeep, if you control a legendary creature, each opponent exiles the top card of their library. Until the end of that turn, you may play those cards and you may spend mana as though it were mana of any type to cast those spells.
Exile Stolen Moments.

Beckon Drake {2}{U}{U} ({2}{U}{U}: This noncreature Deity permanently becomes a Drake creature in addition to its other types.)
Flying
Other creatures you control with flying get +1/+1.

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.

Vigilance
{4}{U}: Draw a card.

Whenever one or more creatures you control deal combat damage to a player, exile a nonland card from that player's graveyard. Copy it. You may cast the copy. (You still pay its costs, including color. Copies of permanents enter as tokens.)

Draw a card. Then you may cast an instant spell with mana value 2 or less from your hand without paying its mana cost.