Forsaken Crossroads

Forsaken Crossroads enters the battlefield tapped.
As Forsaken Crossroads enters the battlefield, choose a color.
When Forsaken Crossroads enters the battlefield, scry 1. If you weren't the starting player, you may untap Forsaken Crossroads instead.
{T}: Add one mana of the chosen color.

Command Mine

{T}: Add one mana of any color in your commander's color identity. If you control a Command Tower and a Command Power Plant, add two mana of any color in your commander's color identity instead.

Fetching Garden

({T}: Add {G} or {W}.)
Fetching Garden enters the battlefield tapped if it was played from your hand.

Bone Rattler

When Bone Rattler is put into your graveyard from anywhere, exile it. When you do, create four Reassembling Skeleton token cards and put them into your graveyard.

Famous Museum

Whenever a creature you control dies, put an art counter on Famous Museum.
{T}: Add {C}, plus an additional {C} for each art counter on Famous Museum.

Karlov's Crossbow

Whenever equipped creature attacks, sacrifice Karlov's Crossbow and destroy target creature an opponent controls.
Equip {1}
Forecast — {0}, Reveal Karlov's Crossbow from your hand: For the remainder of the game, spells you cast named Karlov's Crossbow cost {1} less to cast. (Activate only during your upkeep and only once each turn.)

The Belligerent and Useless Island

({T}: Add {U}.)
The Belligerent and Useless Island enter the battlefield tapped.
When The Belligerent and Useless Island deal combat damage to a player or battle, draw a card, then discard a card.
Crew 2

Built Bear

Legacy (During deckbuilding, circle any number of the following. You can spend 1 point for free. For every 2 points spent beyond that, increase this card's mana cost by {1}.)
1 point each → Flash; deathtouch; reach; vigilance; or ward {2}
2 points → {T}: Add one mana of any color.
3 points each → +1/+1; or +0/+2
4 points → When this creature enters the battlefield, draw a card.

Black Tulip

{T}, Exile Black Tulip: Add three mana of any one color. You can't activate this ability until you've begun your sixth turn of the game. (Keep track if this is in your deck!)

Blood Poet

Spark (Activate spark abilities by spending or giving yourself spark counters. Activate only one spark ability per turn, and only as a sorcery.)
+1: Blood Poet gains lifelink until end of turn.
−3: Target opponent discards a card. You gain life equal to its converted mana cost.

Lazotep Archway

Lazotep Archway enters the battlefield tapped.
{T}: Add {W} or {B}.
Eternalize {3}{W}{B} ({3}{W}{B}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a 4/4 black Zombie creature and loses all other card types. Eternalize only as a sorcery. And don't forget it still enters tapped!)

Gold Mine

{T}: Add {C}.
Legacy — {T}, Mark one of Gold Mine's unmarked nodes: Add one mana of any color.
☐, ☐, ☐, ☐, ☐

Biting Remark

Scrycast {0} (If you see this card while scrying, you may reveal it and cast it by paying {0}.)
Flying

Glade of the Pump Spells

(You have to pay {2}{G} to play this land as your land drop. It's green.)
When Glade of the Pump Spells enters the battlefield, up to one target creature gets +2/+2 and gains trample until end of turn.
{T}: Add {G}{G}.

Sharp Eraser

{2}, {T}: Reveal cards from the top of your library until you reveal a nonland card. You may erase any number of words on the card, including flavor text, as long as the card still makes sense. Then cast the revised card without paying its mana cost. Put all other cards revealed this way on the bottom of your library in a random order.

Pithing Spyglass

As Pithing Spyglass enters, name a keyword ability or ability word.
All cards in all zones lose that keyword ability or ability word and all text tied to that ability.

Maestros' Totally Safe Hideout

Land casualty 2 (As this land enters, you may sacrifice a creature with power 2 or greater. If you do, create a token that's a copy of this land.)
Maestros' Totally Safe Hideout enters the battlefield tapped.
{T}: Add {U}, {B}, or {R}.

Luxior and Shadowspear

Equipped creature gets +1/+1 for each counter on it, and has trample and lifelink.
{1}: Permanents your opponents control lose hexproof and indestructible until end of turn.
Equipped permanent isn't a planeswalker and is a creature in addition to its other types.
Equip creature or planeswalker {3}

The Alright Henge

{T}: Add {G}{G}.
Whenever a nontoken creature enters the battlefield under your control, put a +1/+1 counter on it.

Enchanted Prairie

Enchanted Prairie enters tapped.
{T}: Add {W} or {U}.

Mirrored Lotus

Reflect {0} (As this enters, each opponent may pay {0}. When they do, they create a token copy of this except it lacks this ability.)
{T}, Exile Mirrored Lotus: Add three mana of any one color.

Deep Dish Pizza

Suspend 2—{2} (Deep Dish Pizza has no mana cost and must be suspended.)
{2}, Sacrifice Deep Dish Pizza: Gain 3 life, draw three cards, and Deep Dish Pizza deals 3 damage to each opponent.

Slumbering Waterways

Slumbering Waterways enters the battlefield tapped.
{T}: Add {G} or {U}.
Flying, vigilance, trample

Rampant, Growth

Spell commander (This card can be your commander. In Limited, it can partner like other monocolored legends.)
Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Waste Land

{T}: Add {C}.
{T}, Sacrifice Waste Land: Destroy target nonbasic land. That land's controller creates a Wastes token. (It's a land with {T}: Add {C}.)

Mox Poison

{T}: Add one mana of any color. You get two poison counters.

The Heron Moon

{T}: Add {C}.
{1}, {T}: Exile the bottom card of target opponent's library.
Whenever one or more cards an opponent owns are put into exile, put a release counter on The Heron Moon. Then if it has thirteen or more release counters on it, sacrifice it and create a copy of Emrakul, the Promised End. Cast it without paying its mana cost.

Aggressive Crag

At the beginning of your combat step, tap Aggressive Crag.
{T}: Add {R} or {W}.

Personal Decoy

Personal Decoy enters with a number of loyalty counters on it equal to your life total. If it would leave the battlefield, exile it instead of putting it anywhere else. You can't be attacked.
+1: You gain 1 life.
−4: Draw a card.

The Magical City, New

The Magical City, New enters the battlefield tapped.
{T}: Add {W}, {U}, or {R}. When this mana is spent to cast a legendary spell, put a +1/+1 counter on this land.
{4}: The Magical City, New becomes a 1/1 white, blue, and red Human Artist creature until end of turn.
The Magical City, New can be your Commander. (Commander tax still applies.)

Command Tower

{T}: Add one mana of any color in your commander's color identity.

You, Magic Playtester

{T}: Choose target playtest card. Increase or decrease a number of your choice on it by one for as long as it remains on the stack or battlefield.
{W}{U}{B}{R}{G}: Reveal the top 8 cards of your library. Put each playtest card among them into your hand, and the rest on the bottom of your library in a random order.

Under-Construction Skyscraper

Level up {1} ({1}: Put a level counter on this. Level up only as a sorcery.)
{T}: Add {C}.
LEVEL 1-7
{T}: Add {W}, {B}, {G}, or {C}.
LEVEL 8+
{T}: Add {W}, {B}, {G}, or {C}. Scry 1.

The Disciple of Vess

Whenever The Disciple of Vess attacks, you may put a planeswalker card from your hand onto the battlefield. If you don't, create a token that's a copy of a Liliana planeswalker chosen at random.
(There are currently thirteen. Perhaps look up the list and roll a D20?)

Processing Plant

Processing Plant enters the battlefield tapped.
When Processing Plant enters the battlefield, you may put a card an opponent owns from exile into that player's graveyard. If you do, untap Processing Plant. Otherwise, exile the top card of each opponent's library.
{T}: Add {W}, {U}, {B}, or {C}.

Take a Trip to...

Draw two cards. This spell deals 2 damage to each opponent. (Then exile this card. You may play the land later from exile.)

Value Town

Value Town enters the battlefield tapped.
{T}: Add {U} or {R}.

Value Town // Take a Trip to...

The Unknown Wizard

Eminence — As long as The Unknown Wizard is in the command zone or on the battlefield, other playtest cards you cast cost {1} less to cast.
Whenever The Unknown Wizard enters or attacks, look at the top ten cards of your library. You may put a legendary playtest card from among them onto the battlefield. Put the rest on the bottom in a random order.

Your Mana Rock

Your Mana Rock enters the battlefield tapped.
During deckbuilding, write two different colors on Your Mana Rock.
{T}: Add one mana of a color written on Your Mana Rock.

Guildmark

Pledge (Join a two-colored guild if you haven't already this game.)
{T}: Add one mana of your guild's colors.

Wrenn and One

+1: Wrenn and One gains "{T}: Add {G}" until your next turn.
−1: Create a 1/1 green Squirrel creature token.
−4: You get an emblem with "At the beginning of your precombat main phase, add {G} for each creature you control."

Madlands

Madlands enters the battlefield tapped.
{T}: Add {B} or {R}.
Madness {0} (If you discard this card, discard it into exile. When you do, play it for its madness cost or put it into your graveyard. You can play a land only during your turn and only if you have an available land play remaining.)

Command Power Plant

{T}: Add one mana of any color in your commander's color identity. If you control a Command Tower and a Command Mine, add two mana of any color in your commander's color identity instead.
Command Towers you control have, "{T}: If you control a Command Mine and a Command Power Plant, add three mana of any color in your commander's color identity."

Taiga Stadium

Taiga Stadium enters tapped unless you control a white, blue, or black permanent.
{T}: Add {R} or {G}.

Domesticated Watercourse

Domesticated Watercourse enters tapped.
{T}: Add {U} or {B}.
{U}{B}: Until end of turn, Domesticated Watercourse becomes an Equipment artifact with equip {2}.
Whenever equipped creature deals combat damage to a player, draw a card.

Stika, Playtestress

Whenever you cast a playtest card, draw a card. This ability triggers only once each turn.

The Value Knight

When The Value Knight enters the battlefield, create Syr Acha, a 1/1 legendary red artifact creature Food Knight token with "{2}, {T}, Sacrifice this token: You gain 3 life. Until end of turn, if you would draw a card, draw two cards instead."
Whenever you draw a card, put a +1/+1 counter on The Value Knight.

Trampled Lotus

{T}, Sacrifice Trampled Lotus: Tap up to three lands your opponents control for mana. This ability has splitter second. (It can't be responded to. By, like, anything.)

The Paradise Bird

Flying
Other Birds you control get +1/+1.
{G}, {T}: Create a Birds of Paradise token.
If The Paradise Bird is your commander, your deck can include cards of any color identity.

Artifact Unknown Shores

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

Guilded Lotus

Pledge (Join a two-colored guild if you haven't already this game.)
{T}: Add three mana in any combination of your guild's colors

Mana Conference

When Mana Conference enters the battlefield, each player secretly chooses a basic land type, then those choices are revealed. Mana Conference gains each basic land type that received at least one vote. (Basic land types are Plains, Island, Swamp, Mountain, and Forest.)

Kevin, Questing Dragon

Kevin can't be countered, devour 2
Flying, mountainwalk, rampage 2, bushido 2, trample over planeswalkers
Damage can't be prevented.
Players can't gain life.
Whenever Kevin deals combat damage to a player, gain control of target land that player controls. Untap it.

Temur Elevator

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)
{T}: Add {G}, {U}, or {R}. If you don't have the city's blessing, you lose 1 life.