{R}: Stone Kavu gets +1/+0 until end of turn.

{W}: Stone Kavu gets +0/+1 until end of turn.

Stone Quarry enters the battlefield tapped.

{T}: Add {R} or {W}.

Destroy target land.

When Stone Retrieval Unit enters the battlefield, create a tapped Powerstone token. (It’s an artifact with “{T}: Add {C}. This mana can’t be spent to cast a nonartifact spell.”)

Flying

{4}, Exile a card from your graveyard: Target creature gains flying until end of turn.

Landfall — Whenever a land enters the battlefield under your control, untap Stone-Seeder Hierophant.

{T}: Untap target land.

{4}{W}: Prevent all damage that would be dealt to Stonewise Fortifier by target creature this turn.

{7}{G}: Stonewood Invoker gets +5/+5 until end of turn.

Stonework Packbeast is also a Cleric, Rogue, Warrior, and Wizard.

{2}: Add one mana of any color.

{1}{U}, {T}: You may tap or untap target creature.

Islandwalk (This creature can’t be blocked as long as defending player controls an Island.)

Merfolk spells and Wizard spells you cast cost {1} less to cast.

Whenever Stonybrook Schoolmaster becomes tapped, you may create a 1/1 blue Merfolk Wizard creature token.

Put a +1/+1 counter on target creature you control. Untap that creature.

Flash

Enchant artifact or creature

When Stop Cold enters the battlefield, tap enchanted permanent.

Enchanted permanent loses all abilities and doesn’t untap during its controller’s untap step.

Target player discards a card.

Gotcha — If an opponent audibly flicks the cards in their hand, you may say “Gotcha!” When you do, return Stop That from your graveyard to your hand.

Flying

Stormbound Geist can block only creatures with flying.

Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner’s control with a +1/+1 counter on it.)

When Storm Caller enters the battlefield, it deals 2 damage to each opponent.

Sacrifice Stormcaller’s Boon: Creatures you control gain flying until end of turn.

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom of your library in a random order.)

Flying (This creature can’t be blocked except by creatures with flying or reach.)