{T}: Add {C}.
{4}: Rumbling Door becomes a 3/3 Golem creature with vigilance. It's still a land.

{1}{R}: Rumbling Volcamel and up to one other target creature you control get +1/+0 until end of turn.
Whenever you activate a nonmana ability, if you've spent at least six mana to activate nonmana abilities this turn, transform Rumbling Volcamel.

Whenever you attack, defending player loses 2 life and you gain 2 life.

Deathtouch
Landfall — Whenever a land you control enters, Sandstorm Dancer acclimates.

Reach
When Sandstorm Devil enters, it acclimates.
As long as you control a Weather or another Dragon, Sandstorm Devil has menace.

Whenever Scattering Swine deals combat damage to a player, you may return a permanent you control to its owner's hand. If you do, defending player loses 3 life unless they discard a card that shares a type with the returned permanent.

When Scruffy Rascal enters, mill three cards. You may put a permanent card from among the cards milled this way into your hand. If you don't, create a Treasure token.

Surface {U}. Scuttling Cicada surfaces transformed.

When Sea Breeze enters, return up to one target creature to its owner's hand, then surveil 1.

When Seafloor Scavenger enters or deals combat damage to a player, you may return target exiled card with surface you own to your hand.

Look at the top two cards of your library. Put one into your hand and the other into your graveyard.
Surface {2}{U}

At the beginning of each end step, create a 2/2 white and blue Seal Orb creature token if you activated two or more nonmana abilities this turn.
{W}{U}: Scry 1. You gain 1 life.

This spell costs {2} less to cast if you've activated a nonmana ability this turn.
Searing Grace deals 3 damage to any target.

Serpentine Woods enters tapped.
{T}: Add {B} or {G}.
{2}{B}{G}, {T}, Sacrifice Serpentine Woods: Draw a card.

{B}, Sacrifice Serrated Fossil: Choose a nonland card name. Target player reveals their hand and discards a card with that name if able. Activate only as a sorcery.
Surface {3}{B}{B}. Serrated Fossil surfaces transformed.

When Shadow Sky enters and whenever you cast a spell, each creature target player controls gets -1/-1 until end of turn.

Whenever Shining Angler attacks, target creature an opponent controls blocks Shining Angler this turn if able and other creatures can't block Shining Angler this turn.
Surface {4}{B}{G}{U}

Menace
Whenever Ship Shredder enters or you cast a spell from your graveyard, each opponent loses 2 life and you gain 2 life.

Whenever you activate an ability that targets Shiver Elemental, you may copy that ability. You may choose new targets for the copy.

Landfall — Whenever a land you control enters, you gain 2 life and put a soot counter on Sifting Through Soot.
{B}, Remove two soot counters from Sifting Through Soot: Target player loses 2 life.
{3}{B}, Remove five soot counters from Sifting Through Soot and sacrifice it: Return target artifact or creature card from your graveyard to the battlefield. Activate only as a sorcery.

Whenever a token you control enters, put a +1/+1, flying, haste, trample, vigilance, or loyalty counter on a permanent you control other than Simul.
[+1]: Create a 1/1 green Plant creature token.
[–2]: Create a blue Aura enchantment token with enchant permanent and “When enchanted permanent dies, you draw two cards.”
[–5]: Create a 3/3 green, blue, and red Dragon creature token with flying. For each kind of counter on permanents you control, you may put a counter of that kind on it.

Exile target creature or enchantment if its mana value is less than or equal to the number of spells named Singularity you've cast this game.

{T}: Add {C}.
{3}, {T}: Create a 1/1 white Golem creature token. Spend mana of three different colors to activate this ability.
{T}: Put a +1/+1 counter on target creature. It gains flying until end of turn. Activate only as a sorcery and only if you control ten or more permanents.

Once each turn, when Smart Shopper enters or you cast a creature spell, you may create a Berry token. If three or more types of mana were spent to cast it, create two of those tokens instead.

When Smiling Sludge enters, create a Berry token.
Whenever you sacrifice a nonland permanent, target opponent loses 1 life and you gain 1 life.