Menace
{VP}{VP}: Sizzling Star gets +1/+0 until end of turn.

When Skarni Patrol enters, if you control an Equipment, you draw a card and you lose 1 life.
Pay 2 life: The next equip ability you activate this turn costs {2} less to activate. Activate only once each turn.

Whenever Skarni Raider attacks, if it's equipped, you draw a card and you lose 1 life.

Equipped creature gets +3/+0 and has menace.
Whenever a creature you control enters, if it wasn't cast, you may attach Skeleton Keytar to it.
Equip {5}

Whenever a permanent you control enters, you may put a living counter on it.
Permanents with living counters on them are 2/2 artifact creatures in addition to their other types.

Whenever you cast a green spell, choose up to X, where X is the number of green mana symbols in that spell's mana cost —
• Create a 1/1 white Human creature token.
• Put a +1/+1 counter on a creature you control.
• Put a trample counter, vigilance counter, or a reach counter on a creature you control.
• Untap target land.

Trample
Whenever another creature you control becomes the target of a spell you control, create a token that's a copy of that creature, except it has haste. Sacrifice that token at the beginning of the next end step.

As an additional cost to cast this spell, sacrifice a creature.
When Skophos Conqueror enters, draw a card. Skophos Conqueror deals 2 damage to each opponent.

Trample
Whenever Skophos Raid-Veteran deals combat damage to a player or planeswalker or becomes the target of a spell you control, create a tapped Treasure token.

Menace
Whenever your Champion attacks, you may discard a card. If you do, draw a card.

When Skophos Warden enters, you may exile target artifact or enchantment an opponent controls until Skophos Warden leaves the battlefield.

Whenever Skotha enters or attacks, target player discards a card and you untap all lands you control.
{2}{B}{G}: Return Skotha from your graveyard to the battlefield, then put it on the bottom of its owner's library. Activate only as a sorcery.

Choose one —
• Skysnipe deals 5 damage to target creature with flying.
• Put a +1/+1 counter and a reach counter on target creature. Untap it.

Whenever you cast an instant or sorcery spell, Skyward Magus gets +1/+1 and gains flying until end of turn.

Menace
Other creatures you control with menace get +1/+1.
Whenever a creature you control with menace becomes blocked, each opponent loses 1 life.

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.

Flying
Favored
Whenever another legendary nontoken creature you control dies, you may exile it. If you do, create a token that's a copy of it, except it has no name, it isn't legendary, and it is a Zombie.

When Slumbering Grove enters, search your library for a basic land card, reveal it, put it into your hand, then shuffle.
Spellcharge 8

Enchant land you control
Enchanted land is a 6/6 green Serpent creature with hexproof and haste. It's still a land.
When enchanted land dies, return that card to its owner's hand.

Flying, haste
At the beginning of combat on your turn, if you've cast an instant or sorcery spell with mana value 4 or greater this turn, you may return Smolderwing from your graveyard to the battlefield.

Whenever Smooth Operator deals combat damage to a player, draw a card.

Whenever one or more creatures crew Smuggler's Convoy, you may move any number of counters from those creatures to Smuggler's Convoy.
Crew 1

When Snowscryer enters, surveil 3.

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.