Flying
At the beginning of your upkeep, mill a card. If an instant or sorcery card was milled this way, transform Aberrant Researcher.

Spells your opponents cast that target Accursed Witch cost less to cast.
When Accursed Witch dies, return it to the battlefield transformed under your control attached to target opponent.

Untap target creature. It gets +2/+2 and gains reach until end of turn. (It can block creatures with flying.)

Target opponent loses 3 life and you gain 3 life.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

This spell can't be countered.
You may have Altered Ego enter the battlefield as a copy of any creature on the battlefield, except it enters with X additional +1/+1 counters on it.

Nontoken creatures you control get +1/+1 and have vigilance.

Trample, hexproof

Flying
Delirium — Whenever Angel of Deliverance deals damage, if there are four or more card types among cards in your graveyard, exile target creature an opponent controls.

As an additional cost to cast this spell, sacrifice a permanent.
Exile target artifact, creature, or enchantment.

Exile target nonland permanent. You lose 3 life.

Flying
When Apothecary Geist enters the battlefield, if you control another Spirit, you gain 3 life.

Flash
Flying, vigilance
When Archangel Avacyn enters the battlefield, creatures you control gain indestructible until end of turn.
When a non-Angel creature you control dies, transform Archangel Avacyn at the beginning of the next upkeep.

[+1]: Until end of turn, up to one target creature gets +2/+2 and gains vigilance and haste.
[0]: Create a 2/2 green Wolf creature token. Transform Arlinn Kord.

[+1]: Creatures you control get +1/+1 and gain trample until end of turn.
[−1]: Arlinn, Embraced by the Moon deals 3 damage to any target. Transform Arlinn, Embraced by the Moon.
[−6]: You get an emblem with "Creatures you control have haste and ': This creature deals damage equal to its power to any target.'"

Equipped creature gets +3/+3 and has first strike.
Equip

At the beginning of each player's upkeep, if that player has no cards in hand, you draw a card and you lose 1 life.
Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

: Mill a card.
Delirium — At the beginning of your end step, if there are four or more card types among cards in your graveyard, transform Autumnal Gloom.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
Avacyn's Judgment deals 2 damage divided as you choose among any number of targets. If this spell's madness cost was paid, it deals X damage divided as you choose among those permanents and/or players instead.

Flying
When this creature transforms into Avacyn, the Purifier, it deals 3 damage to each other creature and each opponent.

At the beginning of your end step, if Avacynian Missionaries is equipped, transform it.