Contamination

At the beginning of your upkeep, sacrifice Contamination unless you sacrifice a creature.
If a land is tapped for mana, it produces instead of any other type and amount.

Sunder

Return all lands to their owners’ hands.

Polluted Mire

Polluted Mire enters the battlefield tapped.
: Add .
Cycling (, Discard this card: Draw a card.)

Stalking Stones

: Add .
: Stalking Stones becomes a 3/3 Elemental artifact creature that’s still a land. (This effect lasts indefinitely.)

Warrior en-Kor

: The next 1 damage that would be dealt to Warrior en-Kor this turn is dealt to target creature you control instead.

Manabond

At the beginning of your end step, you may reveal your hand and put all land cards from it onto the battlefield. If you do, discard your hand.

Spike Hatcher

Spike Hatcher enters the battlefield with six +1/+1 counters on it.
, Remove a +1/+1 counter from Spike Hatcher: Put a +1/+1 counter on target creature.
, Remove a +1/+1 counter from Spike Hatcher: Regenerate Spike Hatcher.

Volrath’s Dungeon

Pay 5 life: Destroy Volrath’s Dungeon. Any player may activate this ability but only during their turn.
Discard a card: Target player puts a card from their hand on top of their library. Activate this ability only any time you could cast a sorcery.

Killer Whale

: Killer Whale gains flying until end of turn.

Warrior en-Kor

: The next 1 damage that would be dealt to Warrior en-Kor this turn is dealt to target creature you control instead.

Duct Crawler

: Target creature can’t block Duct Crawler this turn.

Brush with Death

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Target opponent loses 2 life. You gain 2 life.

Hammerhead Shark

Hammerhead Shark can’t attack unless defending player controls an Island.

Pincher Beetles

Shroud (This creature can’t be the target of spells or abilities.)

Sandstone Warrior

First strike (This creature deals combat damage before creatures without first strike.)
: Sandstone Warrior gets +1/+0 until end of turn.

Stalking Stones

: Add .
: Stalking Stones becomes a 3/3 Elemental artifact creature that’s still a land. (This effect lasts indefinitely.)

Firefly

Flying
: Firefly gets +1/+0 until end of turn.

Tawnos

You may cast artifact, creature, and enchantment spells as though they had flash.