msem-instigator

When Poisonblade Herald enters, put a -1/-1 counter on a creature you control.

Fiery Erasure deals 3 damage to target creature or planeswalker. If that permanent would die this turn, exile it instead.

({T}: Add {G} or {U}.)
As Mushroom Lagoon enters, you may pay {1}. If you don't, Mushroom Lagoon enters tapped.

Whenever you cast a creature or planeswalker spell, if mana produced by a nonland permanent was spent to cast it, it gains trample and haste until end of turn.
{T}: Add {R} or {G}.

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.

This spell costs {1}{B} less to cast if you've cast a spell from anywhere other than your hand this turn.
Destroy target creature or planeswalker.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
You don't lose unspent red mana as steps and phases end.
I, II — Add {R}{R}.
III — Create a 3/3 red Phoenix creature token with flying, haste, and “{R}: This creature gets +1/+0 until end of turn.”

Target player discards two cards. If a creature you control died this turn, that player loses 2 life.

Wu Xing (Add effects based on the number of colors of mana spent to cast this spell.)
1 | Draw three cards.
5 | Add {W}{U}{B}{R}{G}. You can cast only one more spell this turn.

Stunning Cascade enters tapped.
{T}: Add {U} or {R}.
{2}{U}{R}, {T}, Sacrifice Stunning Cascade: Draw a card.

Trample
Each creature you control can't have power less than 11 and can't have toughness less than 11. (If it would have less, it has 11 instead.)

Prowess
When Grasper of Secrets enters, choose one —
• Return target creature to its owner's hand.
• Return target instant or sorcery card from your graveyard to your hand.
Evoke {2}{U} (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters.)

Legacy (You may play this side of this card only from your graveyard. Exile it if it would be put into a graveyard or not resolve.)
Volcano Sacrifice deals damage to target creature or planeswalker equal to the number of creature cards in your graveyard.

Mill two cards, then you may return a permanent card that was put into your graveyard from anywhere this turn to your hand.

Whenever Eternal Scout attacks, untap each other creature you control.

Choose one or more —
• Target player draws two cards.
• Counter target spell.

Haste
Frenzy 3 (Whenever this creature attacks and isn't blocked, it gets +3/+0 until end of turn.)
Whenever Anaz, Bloodmother attacks, create a 2/1 red Lizard creature token with frenzy 2 that's tapped and attacking.

Battalion — Whenever Battleborn Brute and at least two other creatures attack, Battleborn Brute gets +2/+2 until end of turn. Untap it.

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Fabled {4}{W}{W} (Then if you cast this for its fabled cost, put it onto the battlefield transformed attached to that creature.)

Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)

Choose one —
• Destroy target artifact.
• Add {R}{R}{R}.

Reveal the top six cards of your library. Put all noncreature cards revealed this way into your graveyard, put the rest back on top in any order, then draw cards equal to the number of cards put on top.

Flying, lifelink
When Archdemon Shilgengar enters, exile all land cards from your graveyard, exchange your graveyard and library, then shuffle your library.
You can only cast spells by paying life equal to their mana value rather than paying their mana cost.

Calamitous Rampage deals 5 damage to any target.
Cycling {G} ({G}, Discard this card: Draw a card.)

Menace
Whenever Algrin's Legacy becomes the target of a spell an opponent controls, that spell's controller loses 5 life unless they discard a card.