Counter target spell.
At the beginning of your next upkeep, pay . If you don't, you lose the game.

This land enters tapped unless you control a Mountain.
: Add .
, : Creatures you control get +1/+0 until end of turn.

: Add .
, : Put target artifact card from your graveyard on top of your library.

This land enters tapped unless you control a Forest or a Plains.
: Add or .

This land enters tapped unless you control two or more other lands.
: Add or .

: Add .
, , Sacrifice this land: Create X Treasure tokens.

: Add one mana of any color that a land an opponent controls could produce.

This land enters tapped unless you control two or fewer other lands.
: Add or .

: Add .

: Add .
: Add or . This land deals 1 damage to you.

: Add .
, : You may cast spells this turn as though they had flash.

: Add .

: Add .
: Add or . This land deals 1 damage to you.

This land enters tapped unless you have two or more opponents.
: Add or .

This land enters tapped unless you control a Mountain.
: Add .
, , Exert this land: Add . If that mana is spent on a creature spell, it gains haste until end of turn. (An exerted permanent won't untap during your next untap step.)

: Add .

Suspend 4—
Until end of turn, you may play lands and cast spells from your graveyard.
If a card would be put into your graveyard from anywhere this turn, exile that card instead.

As this land enters, you may reveal a Mountain or Forest card from your hand. If you don't, this land enters tapped.
: Add or .

: Add .
, , Pay life equal to the number of colors in your commanders' color identity: Draw a card.

: Add .
, Sacrifice a creature: You gain 1 life.

This land enters with three mining counters on it.
, Remove a mining counter from this land: Add one mana of any color. If there are no mining counters on this land, sacrifice it.

(: Add or .)
This land enters tapped.
Cycling (, Discard this card: Draw a card.)

This land enters tapped unless you have two or more opponents.
: Add or .

Hideaway 4 (When this land enters, look at the top four cards of your library, exile one face down, then put the rest on the bottom in a random order.)
This land enters tapped.
: Add .
, : You may play the exiled card without paying its mana cost if a library has twenty or fewer cards in it.

: Add .
, : Untap target legendary permanent.

(: Add .)
As this land enters, you may reveal a Treefolk card from your hand. If you don't, this land enters tapped.
: Add or . This land deals 1 damage to you.

: Add .

When this land enters, if you control two or more Gates, you gain 3 life.
: Add .
: Add one mana of any type that a Gate you control could produce.

If this card is in your opening hand and you're not the starting player, you may begin the game with Gemstone Caverns on the battlefield with a luck counter on it. If you do, exile a card from your hand.
: Add . If Gemstone Caverns has a luck counter on it, instead add one mana of any color.

If you control two or more other lands, this land enters tapped.
: Add .
: Until end of turn, this land becomes a 3/2 red Goblin creature with "Whenever this creature attacks, create a 1/1 red Goblin creature token that's tapped and attacking." It's still a land.

: Add .
, : Put a +1/+1 counter on target Bird, Cat, Dog, Goat, Ox, or Snake.

This land enters tapped unless you control a Mountain or a Plains.
: Add or .

As this land enters, you may reveal a Merfolk card from your hand. If you don't, this land enters tapped.
: Add or .

Dark Depths enters with ten ice counters on it.
: Remove an ice counter from Dark Depths.
When Dark Depths has no ice counters on it, sacrifice it. If you do, create Marit Lage, a legendary 20/20 black Avatar creature token with flying and indestructible.

This land enters tapped.
: Add .
Transmute (, Discard this card: Search your library for a card with mana value 0, reveal it, put it into your hand, then shuffle. Transmute only as a sorcery.)

, : Add .