Put a haste counter on up to one target creature.
Draw a card.

Vigilance
{T}: Add {C}.
{T}: Add {C}{C}. Activate only if Steadfast Gatekeepers is a creature.
Spellcharge 3

Enchant creature
Enchanted creature gets +3/+3.
{4}{G}, Exile Steady Bass from your graveyard: Put three +1/+1 counters on target creature. Activate only as a sorcery.

Steam Colony enters tapped.
{T}: Add {U} or {R}.
{1}, Discard Steam Colony: Scry 2.

Steamveil Model enters with a +1/+1 counter on it.

Whenever Steelhorn Crusher or another artifact you control enters, artifact creatures you control gain menace until end of turn.

Exile target creature, then return that card to the battlefield under its owner's control. When you do, pay for and choose any number.
+{W} — Distribute two +1/+1 counters among one or two creatures you control.
+{C} — Exile that creature again. Return that card to the battlefield under its owner's control at the beginning of the next end step.
+{B} — All creatures get -1/-1 until end of turn.

When Stehlian Reverend enters, put a +1/+1 counter on target creature.
Cybersoul {4}{W}

This spell costs {1} less to cast for each differently named land you control.
Stella's Journal enters with X page counters on it.
At the beginning of your end step, if you have fewer cards in hand than the number of page counters on Stella's Journal, draw cards equal to the difference.

Flying
Whenever an opponent spends mana, if it wasn't spent to cast a spell from their hand, you draw a card. This ability triggers only once each turn.

Sterling enters under the control of an opponent of your choice.
At the beginning of your upkeep, surveil 1.
Play with the top card of your library revealed.
Your opponents may play lands and cast spells from the top of your library during their turns, and they may spend mana of any type to cast spells this way.

Favored
Whenever your Champion attacks, it gets +2/+0 until end of turn.

Exile the top four cards of target opponent's library. Until the end of your next turn, you may play two of those cards, and mana of any type can be spent to cast them.

When Stonework Infuser enters, create a 1/1 blue Gargoyle artifact creature token with flying.

Any number of creatures you control fight different creatures you don't control. Each other creature you control gets +3/+3 and gains trample until end of turn.

Whenever an attacking creature you control dies, Storming the Palace deals 1 damage to each opponent and you gain 1 life.
At the beginning of combat on your turn, you may pay {R/W}. If you do, create a 1/1 red and white Peasant creature token with haste and “This creature attacks each combat if able.”

Flying
Ward {X}, where X is the number of enchantments you control.
Whenever Stormscraper of Ketaphos deals combat damage to a player or planeswalker, create a token that's a copy of another target enchantment you control.

Equipped creature gets +1/+3 and has vigilance.
Equip {5}. This ability costs {2} less to activate if you have at least 3 life more than your starting life total.

When Stratos Sentry enters, target opponent chooses a nontoken creature they control. You integrate that creature.
As long as a creature card with power 3 or less is integrated onto Stratos Sentry, it gets +1/+0 and has flying.

Once each turn, when an opponent is dealt damage, you may pay {R} and discard up to X cards, where X is equal to the damage dealt. If you do, draw that many cards. Put a +1/+1 counter on Strongarm Gambler.

Whenever Strongarm Revolutionary attacks, you may have it dare 4.

As an additional cost to cast this spell, put X cards from your hand on the bottom of your library. This spell costs {X} less to cast.
Scry 2, then draw three cards.

Studio Excelsior enters tapped.
{T}: Add {R}, {G}, or {W}.
{VP}{VP}{VP}{VP}, Discard Studio Excelsior: Target creature gets +2/+2 until end of turn and can't be blocked this turn.

{T}: Create a Treasure token.
{T}, Sacrifice a Treasure: Put a +1/+1 counter on target creature. Activate only as a sorcery.
{T}, Sacrifice two Treasures: Create a 0/0 colorless Robot artifact creature token with four +1/+1 counters on it. Activate only as a sorcery.
{3}: Untap Subsidized Market.

Surveil 2, then draw two cards.