msem-instigator

Indestructible
Marva of Endless Inspiration can't attack or block unless you've cast a spell with mana value 4 or greater this turn.
At the beginning of your end step, return a card at random from your graveyard to your hand. If it's a land card, return it to the battlefield instead.

Whenever one or more cards are put into exile from anywhere, target opponent loses 1 life.
Whenever one or more creatures you control deal combat damage to a player, you may pay 2 life. If you do, purge. (Exile two cards that share a type from graveyards. If you do, draw a card.)

Equipped creature gets +2/+1.
Whenever a creature you control deals combat damage to a player or planeswalker, you may attach Mervin's Armor to it.
Equip {4}

{T}: Add one mana of color.
{3}{G}, {T}: Audition for green. Activate only as a sorcery. (Create a 1/1 Construct Actor creature token, a Scout Role giving 2/3 and vigilance, or a Warrior Role giving 3/2 and trample. Roles replace older ones.)

Whenever an enchantment enters the battlefield under your control, choose one that hasn't been chosen this turn —
• Draw a card.
• Put two +1/+1 counters on target creature you control.

{2}{U}, Remove a counter from a permanent you control: If it was a +1/+1 counter, draw a card. If it was a lore counter, put a +1/+1 counter on Minnow's Accomplice. Activate only as a sorcery.

Flying, deathtouch
Whenever an opponent loses life for the first time each turn, that player loses 1 life and you gain 1 life.

Reach
At the beginning of your end step, if you've gained 3 or more life this turn, create a 3/3 black Demon Horror creature token and each player loses 3 life.

As an additional cost to cast this spell, sacrifice a token or pay 2 life.
Draw two cards.

Whenever you draw your second card or cast your second spell each turn, put a +1/+1 counter on Monument to Quia.
{U}: Monument to Quia becomes a 0/0 Statue artifact creature with flying until end of turn.

When Mourners of Mervin enters the battlefield, you may sacrifice a creature or enchantment. If you do, creatures you control get +1/+1 and gain vigilance until end of turn.

Search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Compose (Then if you cast this from your hand, exile it and create a Saga token with “III—You may cast a copy of this card from exile without paying its mana cost.”)

Whenever you cast your second spell each turn, audition for blue. (Create a 1/1 Construct Actor creature token, a Wizard Role giving 2/2 and prowess, or a Warlock Role giving 2/1 and flying. Roles replace older ones.)

Flying, haste
You may reveal each card you draw as you draw it. Whenever you reveal a creature card with mana value 1 or less this way, create a token that's a copy of it. That copy gains haste until end of turn.

Whenever you cast a spell, note its colors.
At the beginning of combat on your turn, up to X target creatures get +2/+0 and gain menace until end of turn, where X is the number of colors noted with Off-Set Rumormonger.

Proliferate (Choose any number of permanents and/or players with counters on them, then give each another counter of each kind already there.)
Scry 2, then draw a card.

Return target creature card with mana value 3 or less from your graveyard to the battlefield. If its mana value is less than 3, you gain life equal to the difference.

Draw three cards, then discard two cards.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Over the Moon deals 4 damage to up to one target creature or planeswalker.
II, III — Until end of turn, spells you cast with mana value 4 or greater cost {1} less to cast and can't be countered.
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When Overconfident Batter dies, if it's enchanted or you cast a spell that targeted it this turn, you gain 3 life.

When Paul's Finest Act enters the battlefield, search your library for a legendary red card, reveal it, put it into your hand, then shuffle.
Creatures you control get +1/+0 as long as you've cast a noncreature spell this turn.

Prowess
Whenever you cast your first instant or sorcery spell from your hand during each of your turns, if it doesn't have compose, it gains compose. (Then if you cast this from your hand, exile it and create a Saga token with “r3—You may cast a copy of this card from exile without paying its mana cost.”)

When Paul, Rock Bottom dies, you may discard a card. If you do, return this card from your graveyard to your hand at the beginning of the next end step.
[+1]: Draw a card, then discard a card.
[0]: Until end of turn, Paul becomes a 2/2 Construct creature with prowess. Prevent all damage that would be dealt to them this turn.
[–3]: Return target instant or sorcery card from your graveyard to your hand.

Prowess
Whenever Paul attacks, look at the top card of your library. If it's a noncreature card, you may cast it. If you don't cast the card, you may put it into your graveyard. (You still pay the spell's cost.)

Flying
When Percy's Messenger enters the battlefield, you gain 2 life. You may put a lore counter on a Saga you control.