msem-instigator

Flash
Flying
When Mending Valkyrie enters the battlefield, choose target permanent you own or permanent card with mana value 3 or less in your graveyard. You may return it to your hand.

Look at the top seven cards of your library. You may reveal an Avatar card and/or an enchantment card from among them and put those cards onto the battlefield. Put the rest on the bottom of your library in any order.

Enchant creature
Prevent all damage that would be dealt by enchanted creature.

Equipped creature gets +2/+0 and has first strike.
Equip Cleric or Knight {1}
Equip {3}

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
1, 2 — Tap target creature an opponent controls.
3 — Create two 1/1 white Spirit creature tokens with flying.
​

Whenever another creature you control is dealt damage, put a +1/+1 counter on it. If you do, upgrade Renowned Healer. (Give it one of the listed counters it doesn't already have. The damaged creature must survive to get the counter.)
• +1/+1
• Flying
• Lifelink

Lifelink
Whenever another creature you control with a counter on it dies, return it to its owner's hand. If that creature was an Avatar, return it to the battlefield under your control instead.

[+1]: Creatures you control get +1/+0 and gain respawn until end of turn. (When one dies, if it attacked this turn, return it to its owner's hand.)
[0]: You get an emblem with “Whenever a creature you control attacks, you gain 1 life.”
[–5]: Until end of turn, Revela becomes a legendary Human Cleric Avatar creature with lifelink, indestructible, and “This creature's power and toughness are each equal to your life total.”

Exile target creature with power 3 or greater.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever a creature enters the battlefield under your control, add a quest counter.
1 — You gain 3 life.
2 — Search your library for an Equipment card, reveal it, and put it into your hand. Then shuffle.
3 — You may put an Equipment card from your hand onto the battlefield and attach it to a creature you control.

(Add a quest counter as this enters. Sacrifice after 3.)
Whenever you attack, add a quest counter.
1 — Create a 0/1 white Human creature token named Lost Child.
Scry 2.
2, 3 — Exile a token you control named Lost Child. If you do, create two 1/1 white Soldier creature tokens and you gain 4 life.

Non-Avatar creatures can't attack you or planeswalkers you control unless their controller pays {2} for each of those creatures.

Double strike, vigilance, lifelink

Glitch {3}{W} (Remove one [restriction] for each time you pay the glitch cost.)
Exile target nonland permanent. [Return it to the battlefield under its owner's control at the beginning of the next end step.]

{1}{W}, Sacrifice Town Elder: Return target artifact or enchantment card from your graveyard to your hand.

Flying
{1}{W}, {T}: Tap target creature.

Glitch {1} (Remove one [restriction] for each time you pay the glitch cost.)
Create a token that's a copy of target [noncreature] permanent [you control].

Flying
As long as there are five or more different creature types among creatures you control, Adventuring Guildmage gets +1/+0 and has hexproof.

Flash
If you would upgrade a creature you control, you may put a +1/+1 counter on it instead.
{3}{U}: Put a +1/+1 counter on Affluent Cetanthrope and draw a card.

Flying, prowess

(Add a quest counter as this enters. Sacrifice after 6.)
Whenever you cast an instant or sorcery spell from your hand, add a quest counter.
2, 3, 4, 5 — Exile target instant or sorcery spell you control instead of putting it into your graveyard as it resolves. You may cast that card from exile until Awaken the SOURCE leaves the battlefield.
6 — Exile target instant or sorcery spell you control as it resolves. Until end of turn, you may cast cards exiled with Awaken the SOURCE without paying their mana costs.
​

Counter target spell.

Flash
When Cunning Mimic enters the battlefield, sacrifice it unless you return another artifact or creature you control to its owner's hand.

Glitch {1} (Remove one [restriction] for each time you pay the glitch cost.)
Take an extra turn after this one.
[Skip the untap step of that turn.]
[Skip the draw step of that turn.]
[Skip the combat phase of that turn.]
Exile Cut Causality.