Demonic Hordes

: Destroy target land.
At the beginning of your upkeep, unless you pay , tap Demonic Hordes and sacrifice a land of an opponent’s choice.

Conversion

At the beginning of your upkeep, sacrifice Conversion unless you pay .
All Mountains are Plains.

Basalt Monolith

Basalt Monolith doesn’t untap during your untap step.
: Add .
: Untap Basalt Monolith.

Pestilence

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pestilence.
: Pestilence deals 1 damage to each creature and each player.

Goblin King

Other Goblins get +1/+1 and have mountainwalk.

Conversion

At the beginning of your upkeep, sacrifice Conversion unless you pay .
All Mountains are Plains.

Will-o’-the-Wisp

Flying (This creature can’t be blocked except by creatures with flying or reach.)
: Regenerate Will-o’-the-Wisp. (The next time this creature would be destroyed this turn, it isn’t. Instead tap it, remove all damage from it, and remove it from combat.)

Cursed Land

Enchant land
At the beginning of the upkeep of enchanted land’s controller, Cursed Land deals 1 damage to that player.

Fog

Prevent all combat damage that would be dealt this turn.

Smoke

Players can’t untap more than one creature during their untap steps.

Camouflage

Cast this spell only during your declare attackers step.
This turn, instead of declaring blockers, each defending player chooses any number of creatures they control and divides them into a number of piles equal to the number of attacking creatures for whom that player is the defending player. Creatures those players control that can block additional creatures may likewise be put into additional piles. Assign each pile to a different one of those attacking creatures at random. Each creature in a pile that can block the creature that pile is assigned to does so. (Piles can be empty.)

Pestilence

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pestilence.
: Pestilence deals 1 damage to each creature and each player.

Living Lands

All Forests are 1/1 creatures that are still lands.