msem-instigator

When Undead Archivist enters, return target instant or sorcery card from your graveyard to your hand.
Revive {5}{U} ({5}{U}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

At the beginning of your upkeep, for each of your libraries, look at the top card of that library, then put it on the top or bottom of that library.
{2}, Pay 2 life: Draw a card.

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)
When Bloodied Twinblade dies, scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

Target creature you control fights target creature you don't control. (Each deals damage equal to its power to the other.)
Scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)

This spell costs {1} less to cast for each counter on permanents you control.
Trample
{G}{G}, Remove ten counters from among permanents you control, Exile Grasp of the Stageless from your graveyard: Create a token that's a copy of Grasp of the Stageless. Activate only as a sorcery.

First strike
Whenever a creature dealt damage by Roadside Reaper this turn dies, you may discard a card. If you do, put a +1/+1 counter on Roadside Reaper and draw a card.

Exile target creature and all other creatures with the same name as that creature. Search all graveyards, hands, and libraries for any number of cards with the same name as that creature and exile them. Then players shuffle their libraries searched this way.

Create two 1/1 white Soldier creature tokens. You gain 4 life.

Double strike
Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)

When Urisk Fiddler enters, draw a card.

Target creature gets +2/+2 and gains flying and lifelink until end of turn.
Orchestrate {W} (You may exile this card from your hand anytime you could cast a sorcery for its orchestrate cost. When you next resolve a spell, you may cast this from exile without paying its mana cost.)

At the beginning of your upkeep, put a loyalty counter on each planeswalker you control.
[0]: Tap target creature.
[–1]: Untap target basic land.
[–7]: Draw up to six cards.

Pyrostorm deals 10 damage divided as you choose among any number of targets.

First strike
Angel spells you cast cost {2} less to cast.
As long as you control an Angel, prevent all noncombat damage that would be dealt to Traft, Lunarch's Edge.

As Theodore Harper, Head Librarian enters, choose Fact or Fiction.
• Fact — Permanent spells you cast cost {1} less to cast. This effect can't reduce the amount of mana a spell costs to cast to less than one mana.
• Fiction — When Theodore Harper enters, return a permanent card from your graveyard to your hand.

Destroy target creature with flying. You may put a land card from your hand onto the battlefield.

Choose one. If you're horrific, you may choose both instead. (You're horrific as long as you've sacrificed a permanent or discarded a card this turn.)
• Destroy target artifact.
• Catastrophic Crash deals 3 damage to target creature.

Changeling (This card is every creature type.)
{1}{G/U}: Vune, the Facemaker becomes a copy of target creature you control, except its name is Vune, the Facemaker, it's legendary, and it has changeling and this ability. Activate only as a sorcery.

Recruit four times. (To recruit, create a 0/0 white Soldier Army creature token, then put a +1/+1 counter on each Army you control.)

When Symbiotic Sprout dies, create two 1/1 green Saproling creature tokens.

Trample
Arpechian Champion can only attack or block alone.
Whenever a land you control enters, put a +1/+1 counter on Arpechian Champion.

{1}, {T}: Tap target creature with the greatest power among creatures your opponents control.

Reach
Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)
When Angelbane Spider enters, destroy target creature with flying.

Scry X, where X is the highest toughness among creatures you control, then reveal the top card of your library. If it's a creature with mana value X or less, you may put it onto the battlefield.

Enchant creature
As long as it's your turn, enchanted creature has indestructible.
Whenever enchanted creature attacks, it deals damage equal to its toughness to any target.