msem-instigator

Whenever you cast a spell, put a burst counter on Ascending Downfall, then if that spell's mana value is less than the number of burst counters on Ascending Downfall, sacrifice it and it deals damage equal to the number of burst counters on it to any target.

Thicketed Path enters tapped unless you control one or fewer other lands.
{T}: Add {G} or {W}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Flamethrower deals 4 damage to any target.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
{1}{B}: You gain 1 life.

Whenever a creature attacks you or a planeswalker you control, that creature doesn't untap during its controller's next untap step.

When Scrapgear Contraption dies, you may put a +1/+1 counter on target creature.

Flying, first strike

{T}: Add {C}.
{5}, {T}, Sacrifice Ascendant's Cell: You may activate loyalty abilities of planeswalkers you control twice this turn rather than only once.

Hexproof
When Wary Watchkeeper enters, target player mills three cards.

When Blisterbug dies, put two +1/+1 counters on target creature you control.

When Rotting Sunseeker dies, return target creature card with power 2 or less from your graveyard to your hand.

{B}: Treacherous Shade gets +1/+1 until end of turn.
{1}{B}{B}: Treacherous Shade gets +3/+3 until end of turn.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
Whenever a player activates an ability of an artifact, creature, or land, if it isn't a mana ability, Dedicated Weaponsmith deals 2 damage to that player.

Destroy target artifact or enchantment. Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Counter target spell unless its controller pays {2}.
Reprise {3}{U} (As you cast an instant or sorcery spell, you may exile one card with reprise from your graveyard and pay its reprise cost. If you do, add its effects to that spell.)

[+1]: Draw two cards.
[–1]: Until your next turn, Director Amitai Eliahu gains “Other nonland permanents lose all abilities.”
[–3]: You may discard a card. If you do, you may cast a spell that shares a color with that card without paying its mana cost.
[–9]: Until end of turn, play with your library revealed. You may cast spells from your library this turn.

{T}: Add {C}.
{3}{B}: Until end of turn, Tzhai's Throne becomes a 2/2 creature. It's still a land. It gets +2/+2 if {R} was spent to activate this ability, gets +2/+2 if {G} was spent, and gets +2/+2 if {W} was spent.

Diligent Believer gets +1/+1 for each +1/+1 counter on other creatures you control.

Whenever you draw a card, put a foreshadow counter on Ominous Seas.
Remove eight foreshadow counters from Ominous Seas: Create an 8/8 blue Kraken creature token.
Cycling {2} ({2}, Discard this card: Draw a card.)

Players can't gain life.
At the beginning of each player's upkeep, if that player has 10 or less life, they lose 1 life.

Shimmer (Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Exile the token at the beginning of the end step.)
Whenever you cast an instant or sorcery spell, Noirohpo Renegade gets +1/+0 until end of turn.

Enchant creature
When enchanted creature dies, you draw three cards and you gain 3 life.

Put a +1/+1 counter on target creature. That creature gains first strike until end of turn.
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.”)