Banefire deals X damage to any target.

If X is 5 or more, this spell can't be countered and the damage can't be prevented.

{T}: Add {C}.

{2}: Cavernous Maw becomes a 3/3 Elemental creature until end of turn. It's still a Cave land. Activate only if the number of other Caves you control plus the number of Cave cards in your graveyard is three or greater.

For each of X target permanents, create X tokens that are copies of that permanent.

You may have Echoing Deeps enter the battlefield tapped as a copy of any land card in a graveyard, except it's a Cave in addition to its other types.

{T}: Add {C}.

{T}: Add {C}.

Other Caves you control have "{T}, Pay 1 life: Add one mana of any color."

Hidden Cataract enters the battlefield tapped.

{T}: Add {U}.

{4}{U}, {T}, Sacrifice Hidden Cataract: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Hidden Nursery enters the battlefield tapped.

{T}: Add {G}.

{4}{G}, {T}, Sacrifice Hidden Nursery: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

Hidden Volcano enters the battlefield tapped.

{T}: Add {R}.

{4}{R}, {T}, Sacrifice Hidden Volcano: Discover 4. Activate only as a sorcery. (Exile cards from the top of your library until you exile a nonland card with mana value 4 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)

When you cast this spell, you gain half X life and draw half X cards. Round down each time.

Flying, trample

Hydroid Krasis enters the battlefield with X +1/+1 counters on it.

Spiritual Leader -- At the beginning of combat on your turn, put a +1/+1 counter on target creature.

Psychic Stimulus -- {T}: Add {C}{C}. When you next cast a spell with {X} in its mana cost or activate an ability with {X} in its activation cost this turn, copy that spell or ability. You may choose new targets for the copy. (A copy of a permanent spell becomes a token.)

Pit of Offerings enters the battlefield tapped.

When Pit of Offerings enters the battlefield, exile up to three target cards from graveyards.

{T}: Add {C}.

{T}: Add one mana of any of the exiled cards' colors.

{T}: Add {C}.

{1}, {T}, Sacrifice Promising Vein: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Sunken Citadel enters the battlefield tapped. As it enters, choose a color.

{T}: Add one mana of the chosen color.

{T}: Add two mana of the chosen color. Spend this mana only to activate abilities of land sources.

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Death Frenzy -- When Termagant Swarm dies, create a number of 1/1 green Tyranid creature tokens equal to Termagant Swarm's power.

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Trample

Spawn Termagants -- Whenever Tervigon deals combat damage to a player, create that many 1/1 green Tyranid creature tokens.

At the beginning of your end step, untap all lands you control.

Ravenous (This creature enters the battlefield with X +1/+1 counters on it. If X is 5 or more, draw a card when it enters.)

Flying, ward {2}

Warp Blast -- When Zoanthrope enters the battlefield, it deals X damage to any target.