msem-instigator

Puzzlebox (Begin the game with this and another card you own from outside the game in the command zone, locked. That card is face down until you unlock this.)
{0}: If a player has fifteen or fewer cards in their library, unlock Dreamcast Relic. If the revealed card is blue, put it into your hand. Otherwise, put it on top of your library.

Dreamscape enters the battlefield tapped with two charge counters on it.
{T}: Add {C}.
{T}, Remove a charge counter from Dreamscape: Add one mana of any color.

({T}: Add {W} or {B}.)
Dreary Township enters the battlefield tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

{T}: Add {C}.
{T}, Reappropriate: Add {R} or {W}. (Exile exactly two cards from your hand and/or graveyard.)

Enchant creature
Enchanted creature doesn't untap during its controller's untap step.

Dunesea Expanse enters the battlefield tapped unless you control another Desert.
{T}: Add {W} or {U}.

({T}: Add {B} or {G}.)
Duskwood Thicket enters the battlefield tapped.
Cycling {2} ({2}, Discard this card: Draw a card.)

{T}: Add {C}.
{T}: Target player exiles a nonland card from their graveyard.

Dustchoked Outpost enters the battlefield tapped.
When Dustchoked Outpost enters the battlefield, create a 1/1 Scout creature token that's all colors. It gains haste until end of turn. Sacrifice it at the beginning of the next end step.
{T}: Add {R}.

{T}: Add {C}.
{1}, {T}: Target player exiles a card from their graveyard. If a creature or planeswalker card is exiled this way, create a Vessel token. (It's an enchantment with “{2}, Sacrifice this enchantment: Create a 1/1 white Spirit creature token with flying.”)

{T}: Add {C}.
{T}, Pay 1 life: Add {G}.
{6}{G}, {T}, Sacrifice Ecological Refuge: Create two 3/3 green Wurm creature tokens. Activate only as a sorcery.

When Edge of the World enters the battlefield, each player draws a card.
{T}: Each player adds {C}.

At the beginning of your end step, draw a card for each card you drew this turn.

({T}: Add {B} or {G}.)
As Eerie Bayou enters the battlefield, you may pay {1}. If you don't, Eerie Bayou enters the battlefield tapped.

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

Indestructible
Whenever a creature you control becomes untapped, draw a card.

{T}: Add {C}.
{2}, {T}: Add {C} for each Desert you control.

Elrayin, the Manaroot enters the battlefield 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.

(Transform this if it's not attached to a creature. Pay {3}{G} as a sorcery to unattach it.)
Enchant creature you control
Elven Mount's rider gets +3/+3 and has trample.

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

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

When Endless Trove enters the battlefield, 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.

{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.

Enchant opponent
At the beginning of enchanted player's upkeep, they choose one that hasn't been chosen yet —
• They discard three cards.
• They sacrifice three nonland permanents.
• You transform Enrapturing Grudge.
If Enrapturing Grudge would be put into a graveyard from anywhere, exile it instead.

Enshrouded Village enters the battlefield 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.