msem-instigator

Equipped creature gets +2/+0.
Whenever a creature blocks equipped creature, you may sacrifice Elderbane Rifle. If you do, destroy that creature.
Equip {2}

At the beginning of each combat, you may have Elderin, Crystalline Crusader become a copy of another target creature you control with mana value 3 or less until end of turn, except its name is still Elderin, Crystalline Crusader, it's still 3/3, still legendary, and it's an artifact in addition to its other types.
{W}{U}{B}{R}{G}: Elderin gets +3/+3 until end of turn.

{T}: Add one mana of any color.
{T}, Sacrifice Elderthrone Shard: Draw a card.

[progress 2+]
[progress 5+]
Whenever a creature enters, each opponent loses 1 life.

{T}: Add {C} and one mana of any color.

Equipped creature gets +1/+1 and has prowess.
Equip {2}

{2}, {T}: You gain 5 life. Shuffle Elixir of Immortality and your graveyard into their owner's library.

Elrayin, the Manaroot enters tapped.
Whenever you tap another land for mana, put a creation counter on Elrayin.
{T}, Remove ten creation counters from Elrayin and sacrifice it: Untap all lands target player controls.

{1}, {T}: Exile target creature you control until Elsewhere Mirror leaves the battlefield. (It returns to the battlefield under its owner's control.)
{3}: Choose a permanent card exiled with Elsewhere Mirror. Target creature becomes a copy of that card until end of turn.

{T}, Sacrifice a Snake: Choose a counter on target permanent or player. You may put an additional counter of that kind on that permanent or player.

Sacrifice a land: You may cast a spell from your hand without paying its mana cost. Activate this ability only once each turn.
Exile five land cards from your graveyard: Draw five cards. Exile the top ten cards of your library.

{T}: Add {W} or {U}. You lose 1 life unless you have less life than an opponent.

Flying
Improve {2} ({2}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
At the beginning of combat on your turn, up to two target embattled creatures gain double strike until end of turn. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Flying
Crew 4 (Tap any number of creatures you control with total power 4 or greater: This Vehicle becomes an artifact creature until end of turn.)
Tap two untapped other artifacts you control: Encampment Blimp becomes an artifact creature until end of turn. Scry 1.

{T}: Add {C}.
Concord — {T}: Create a Treasure token. Activate only if there are four or more card types among permanents you control.

Equipped creature gets +1/+1 and has hexproof.
Whenever equipped creature deals combat damage to a player, you may return up to one target instant or sorcery card from your graveyard to your hand.
Equip {3}

When Encrypted Monument is put into your graveyard from anywhere, you may pay {2} and exile it. If you do, draw two cards.

Archive 3 (As this enters, shuffle the top three cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Whenever you draw a card from the archived library, put the top card of your main library on the bottom of the archived library.
{B}: Exchange a card from the archived library with a card from your hand.

When Endless Trove enters, if it's not a token, each opponent may create a token that's a copy of it.
{T}: Add one mana of any color.

When Endmire Scourer dies, search your library for a card with mana value 4 or less, reveal it, put it into your hand, then shuffle.

{T}: Add {C}.
{3}, {T}, Sacrifice Enduring Vestige: Search your library for a land card with a basic land type, put it onto the battlefield tapped, then shuffle.

As Enlightened Sigil enters, choose a card type.
Spells you cast of the chosen type cost {1} less to cast.

Enshrouded Village enters tapped.
{T}: Add {G}.
{1}{G}{G}: Until end of turn, Enshrouded Village becomes a 4/4 Human creature with trample. Activate only if you're horrific.

Equipped creature gets +1/+0 and has poisonous 1. (Whenever it deals combat damage to a player, that player gets a poison counter.)
Equip {1}

{T}: Add {C}.
{4}, {T}, Sacrifice Eon Campfire: Destroy target artifact or nonbasic land.