, , Sacrifice a creature: Forests you control become 2/3 creatures until end of turn. They're still lands.

Destroy target land. If that land was a snow land, you gain 1 life.

Cumulative upkeep—Exile the top card of your library. (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
When a player doesn't pay Thought Lash's cumulative upkeep, that player exiles all cards from their library.
Exile the top card of your library: Prevent the next 1 damage that would be dealt to you this turn.

Defender (This creature can't attack.)
Flying
: Thunder Wall gets +1/+1 until end of turn.

At the beginning of your upkeep, put a time counter on Time Bomb.
, , Sacrifice Time Bomb: Time Bomb deals damage equal to the number of time counters on it to each creature and each player.

Defender (This creature can't attack.)
Sacrifice Tinder Wall: Add .
, Sacrifice Tinder Wall: It deals 2 damage to target creature it's blocking.

(: Add or .)

(: Add or .)

: Varchild's Crusader can't be blocked this turn except by Walls. Sacrifice Varchild's Crusader at the beginning of the next end step.

Enchant creature
Enchanted creature gets +1/+1.
: Return Viscerid Armor to its owner's hand.

, Sacrifice a creature and a Swamp: Destroy target nonartifact creature. It can't be regenerated.
, Sacrifice a creature and a snow Swamp: Destroy target creature. It can't be regenerated.

Defender (This creature can't attack.)
, : Create a 0/1 blue Plant Wall creature token with defender named Kelp.

Prevent all combat damage that would be dealt by target attacking creature this turn.

, Exile the top two cards of your library: Whirling Catapult deals 1 damage to each creature with flying and each player.

All creatures lose flying until end of turn.
Sacrifice a snow land: Return Whiteout from your graveyard to your hand.

Wiitigo enters the battlefield with six +1/+1 counters on it.
At the beginning of your upkeep, put a +1/+1 counter on Wiitigo if it has blocked or been blocked since your last upkeep. Otherwise, remove a +1/+1 counter from it.

Flying
Menace (This creature can't be blocked except by two or more creatures.)

Enchant creature
Enchanted creature gets +1/+0 and has flying and first strike.

Whenever a player taps a snow land for mana, that player adds one mana of any type that land produced. That land doesn't untap during its controller's next untap step.

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Withering Wisps.
: Withering Wisps deals 1 damage to each creature and each player. Activate this ability no more times each turn than the number of snow Swamps you control.