msem-instigator

Haste
Sacrifice another creature: Bygone Aristocrat gains indestructible until end of turn.

Choose one—
• You gain life equal to the number of artifacts you control.
• You gain life equal to the number of enchantments you control.

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.
At the beginning of the upkeep of enchanted creature's controller, that player mills a card.

As an additional cost to cast this spell, sacrifice a creature.
Target creature gains +4/+4 until end of turn.

Whenever another creature you control enters, you may have it gain haste. If you do, return it to its owner's hand at the beginning of the next end step.

When Practiced Sorcerer enters, return target noncreature, nonland card from your graveyard to your hand.

{T}: You gain 1 life.
{1}{W}, {T}: Tap or untap another target creature.

Defender, reach
Aetherlock Effigy can block an additional creature each combat.
When Aetherlock Effigy dies, create two 1/1 black Bird creature tokens with flying.

Siphon (Each -1/-1 counter you put on your creatures up to their remaining toughness while casting this pays for {1}.)
Create a token that's a copy of target creature you control, except it enters with an additional -1/-1 counter on it.

Enchant creature
Enchanted creature has base power and toughness 8/8.

{T}: Add {C}.
{T}, Exile two cards from your graveyard: Add {U} or {R}.

Gain control of target nonland permanent an opponent controls. Its owner reveals cards from the top of their library until they reveal a card that shares a type with that permanent, then puts it onto the battlefield and shuffles.

When Fateshifter's Prophet enters, you gain 2 life and scry 2.

Draw two cards, then discard two cards. Then if you cast Price of Wisdom from your graveyard, create a 3/3 blue Sphinx creature token with flying.
Flashback {4}{U}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

{1}, Sacrifice Ornate Incense: Draw a card. You gain 1 life.

When Festering Shipwreck enters, create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)
At the beginning of each player's upkeep, that player sacrifices a nonland permanent.

Flash
Whenever you cast a spell during an opponent's turn, put a +1/+1 counter
on Petty Thief.
Surpass {5}{U} ({5}{U}: Transform this. This costs {1} less to activate for each counter on
it. Activate only as a sorcery.)

Flying
Whenever an opponent casts a spell, copy it. You may choose new targets for the copy.

(Choose only one work as a sorcery to add its ability.)
When Seto's Private Collection enters, creatures you control get +2/+1 until end of turn.
{1}{R}: Bloodline
Attacking creatures you control have first strike.
{2}{W}: Hope's Savior
Attacking creatures you control have lifelink.

Enchant opponent
Whenever enchanted player is attacked, you may discard a card. If you do, draw a card.

Search your library for a basic land card, reveal it, put it into your hand, then shuffle. Mill three cards.

Menace
Spirited (When this creature enters, you may activate one of its activated abilities without paying its cost.)
{3}{R}: Another target creature you control gains menace until end of turn.

Concord — When Dolphin Rider enters, if there are four or more card types among permanents you control, you gain 5 life.

Sculpted Observatory enters tapped.
{T}: Add {W} or {U}.
{1}, {T}: Add one mana of any color.

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