msem-instigator

Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.
Flashback {3}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Tithe (As you cast this spell, you may tap three artifacts and/or creatures you control.)
Creatures can't attack this turn. If this spell's tithe was paid, opponents can't cast spells this turn.

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.

Each opponent sacrifices a creature. Whenever one or more players lose life this turn, repeat that process.

Equipped creature has menace and trample.
Equip {2}

Double strike

Choose one —
• Target creature gets +1/+1 and gains lifelink until end of turn.
• Target creature gets -2/-2 until end of turn.
• Scry 1, then draw a card.

Until end of turn, cards in graveyards lose all names, card types, and abilities.
Draw a card.

At the beginning of combat on your turn, gain control of target creature an opponent controls with power less than the greatest power among creatures you control until end of turn. Untap that creature. It gains haste until end of turn.

This spell costs {2} less to cast if your starting deck contained at least forty cards more than the minimum deck size.
When Unrivaled Fireweaver enters, you may exile a red instant or sorcery card you own from outside the game. Until the end of your next turn, you may play that card.

Flying
When Heaven's Eyes enters, create a 1/1 white Bird creature token with flying. Then you gain 1 life for each creature in Heaven's Eyes's pack. (Two or more creatures you control with equal power are in a pack.)

Ungoverned Sneak can't be blocked by creatures with greater power.
Attain {3}{U} ({3}{U}: Transform this. Spend at least three colors of mana to activate this, and only as a sorcery.)

As Toxic Spring enters, you may tap an untapped creature you control. If you don't, Toxic Spring enters tapped.
{T}: Add {U} or {B}.

Sacrifice Misleading Wisp:
Counter target spell unless its controller pays {1}.

Flash
Flying
Once during each of your opponent's turns, when you cast a spell, you may pay {1}{U/R}. If you do, copy it. You may choose new targets for the copy. (If it's a permanent spell, the copy becomes a token.)

First strike
When Mutilated Warrior enters, you may have it deal damage to each player equal to the number of Warriors you control.

Create a 2/1 red and white Fox creature token. If you're attacking, that token enters tapped and attacking.
Showcase {4}{R} (Then if you cast this for its showcase cost, create a 1/1 red Bard creature token that can't block and exile this. Whenever it attacks, you may cast a free copy of this.)

When Queue Bouncer enters, return target creature to its owner's hand. If you control another Actor, instead put that creature on top of its owner's library.

Enchant creature
Enchanted creature gets +1/+1.
When enchanted creature dies, you may exile it. If you do, return target creature card from your graveyard to the battlefield.

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
Whenever you cast an enchantment spell, draw a card.
I, II — Tap up to one target nonland permanent and put a stun counter on it. You gain 2 life.
III — Target creature you control gets +1/+1 until end of turn for each enchantment you control.

Trample
Other Dwarves and Elves you control get +1/+1.
If Harl and Finn or another Dwarf or Elf you control entering the battlefield or attacking causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.

Trample
Resolute — At the beginning of combat on your turn, if Helicos Gargantua's power is greater than its base power, double its power until end of turn.

When Wild Waypoint enters, create a 1/1 green Scout creature token.
{T}: Add {B}, {G}, or {U}.

Each creature card you own that isn't on the battlefield has madness. The madness cost is equal to its mana cost. (If you discard a card with madness, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
{T}, Discard a card: Dragonlord's Shrine deals 2 damage to any target.

Choose one —
• Destroy target artifact or enchantment.
• Return target creature to its owner's hand.
• Draw a card.