msem-instigator

Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.)
Search your library for up to three creature cards with different mana values 4 or less, reveal them, put them into your hand, then shuffle. If you're in a renaissance, you may put one of those cards onto the battlefield instead of into your hand.

Enchant land
When Grace of Timber enters, put a +1/+1 counter on target creature you control.
Enchanted land has “{T}: Add two mana of different colors.”

Flying
Whenever a creature you control dies, put a +1/+1 counter on Drove of the Lost.
{1}, Sacrifice a creature: Each opponent loses 1 life. Gain 1 life.

Lonely Aerie enters tapped.
{T}: Add {W} or {U}.
{W}{U}: Until end of turn, Lonely Aerie becomes a Bird creature with flying in addition to its other types.
Scavenge {W}{U}

Avaz Sanctuary enters tapped.
Satrapies you control have “{T}: Add {R} or {W}.”

Pungent Beetle enters with a +1/+1 counter on it for each creature you controlled that died this turn.

First strike, vigilance
Whenever Asamund, Queen of Yroncaster deals combat damage to a player, choose a number. That player can't cast noncreature spells with mana value equal to the chosen number until the end of your next turn.

Look at the top four cards of your library. Put any number of them into your graveyard and the rest on top of your library in any order.
You draw two cards and you lose 2 life.

Menace
Sacrifice another artifact: Scrap Buggy becomes an artifact creature until end of turn.
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)

Lumbering Stoneshell has hexproof as long as it's untapped.

When Ophidian Oracle enters, draw a card, then abound. (To abound, you may cast a spell that costs less than this from your hand without paying its mana cost.)
Recite {2}{G}{G} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

At the beginning of combat on your turn, if you control a creature with power 4 or greater, put a +1/+1 counter on Wilderkin Zealot.
{R}{G}: Target creature gains trample until end of turn.

{T}: Add {C}.
Satrapies you control have “{1}{G}, {T}: Put a +1/+1 counter on target creature. Activate only as a sorcery.”

Equipped creature gets +0/+2 and has menace.
Equip {1}

Sacrifice a land: You may cast a spell from your hand without paying its mana cost. Activate this ability only once each turn.
Exile five land cards from your graveyard: Draw five cards. Exile the top ten cards of your library.

L.O.T.U.S. enters tapped.
When L.O.T.U.S. enters, conjure three cards named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)
{T}: Add three mana of any one color.

Menace
When Fiendish Bruiser enters, exile up to three cards from target player's graveyard.

Regenerate target creature. (The next time that permanent would be destroyed this turn, it isn't. Instead tap it.)

{T}: Add {C}.
{T}: Add {C}{C}{C}. Spend this mana only to pay advance costs.

Whenever Hedge Dashers attacks, if you control a permanent with a counter on it, Hedge Dashers gets +1/+1 and gains trample until end of turn.

Whenever you cast a white spell, choose up to X, where X is the number of white mana symbols in that spell's mana cost —
• Return target creature card with mana value 1 or less from your graveyard to the battlefield.
• Creatures target player controls get +1/+1 until end of turn.
• Target player gains 2 life.
• Tap target creature.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
Flash
I — Draw three cards.
II, III — You may cast a spell with mana value less than or equal to the number of lore counters on The Infinite Calls to Marva from your hand without paying its mana cost.

When Dawson's Warden enters, create a Treasure token.
As long as you control three or more artifacts, Dawson's Warden gets +2/+0 and has first strike.

Return up to two target creature cards with total mana value 4 or less from your graveyard to the battlefield.

When Kaleidostone enters, draw a card.
{5}, {T}, Sacrifice Kaleidostone: Add {W}{U}{B}{R}{G}.