Whenever one or more creatures you control deal combat damage to a player, you may draw that many cards. If you do, discard a card.
Exile two creature cards from your graveyard: Scrapyard Mecha becomes an artifact creature until end of turn. Activate only as a sorcery.
Crew 2

Target player reveals their hand. You may choose a nonland card from it. If you do, that player discards that card. Otherwise, draw a card.

Vigilance
When Seasoned Spymaster enters, teach target creature vigilance.

Flash
When Security Initiative enters, you may tap or untap target nonland permanent. Then draw a card.
An opponent controls three or more tapped nonland permanents.

Vigilance
Whenever Selective Truthseeker or another nontoken creature you control enters, surveil 1. When you put a nonland card into your graveyard this way, you gain 1 life.

Vigilance
{1}, {T}: Tap target creature.

Approval — When Senators' Chauffeur enters, return up to one target creature card with mana value less than or equal to the number of colors among permanents you control from your graveyard to the battlefield.

Whenever a nontoken creature you control dies, create a token that's a copy of it, except it's a Minion and has decayed.

At the beginning of your end step, put a +1/+1 counter on each tapped creature you control.
{G}{W}{U}, Remove five counters from among creatures you control, Sacrifice Severin's Masterwork: Create Chaneryx, Perfect Lifeform, a legendary 10/10 green, white, and blue Leviathan creature token with ward {10}.

You may remove +1/+1 counters from creatures you control as though they were loyalty counters on Severin, Sparkmind to pay its loyalty costs.
[0]: Create a 0/0 colorless Robot artifact creature token with two +1/+1 counters on it.
[–2]: You may tap or untap each of up to three target permanents.
[–7]: If it isn't an extra turn, take an extra turn after this one.

When Silence the Opposition enters, draw two cards, then discard a card.
A creature card or creature token was put into your graveyard from anywhere this turn.

Choose up to one for each color among green, white, and blue among permanents you control.
• Put two +1/+1 counters on target creature.
• Target player draws a card for each creature they control with a counter on it.
• Untap all nonland permanents target player controls.

When Sillaman Ambassador enters, put a +1/+1 counter on each of up to three target creatures you control.
Basic landcycling {1}{W}

Sillaman District enters tapped unless you control a Forest, a Plains, and an Island.
{T}: Add {G}, {W}, or {U}.

When Sillaman Regrafter enters, put a +1/+1 counter on target creature you control.
Whenever a creature you control dies, you may move a counter from it onto another target creature.

Sleeper Insurgent doesn't untap during your untap step.
Whenever Sleeper Insurgent becomes the target of a spell or ability you control, untap it. This ability triggers only once each turn.

Flash
Flying
When Sleeper Strix enters, tap up to one target creature.
You may look at an additional card each time you surveil.

Return target creature to its owner's hand. If you controlled it, create a token that's a copy of it. Otherwise, create a 0/0 colorless Robot artifact creature token with a +1/+1 counter on it.

When Sola enters, create a Treasure token.
{2}, Sacrifice a Treasure: You gain 3 life.
{2}, Sacrifice a Treasure: Draw a card.

When Sparks of a Revolution enters, create a 1/1 colorless Soldier creature token. It gains haste until end of turn.
Three or more sources you controlled dealt damage this turn.
A source you controlled dealt 3 or more damage this turn.

Whenever another creature you control enters, you may pay {X}{X}. If you do, put X +1/+1 counters on that creature.
{T}: Add one mana of any color.

Splintering Blast deals 4 damage to target creature. If you controlled a creature with menace as you cast this spell, instead Splintering Blast deals 4 damage divided as you choose among up to two target creatures.

Enchant creature
When Stasis Chamber enters, if you control a creature with vigilance, tap enchanted creature.
Enchanted creature doesn't untap during its controller's untap step.

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.

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.