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As an additional cost to cast this spell, sacrifice a creature.
Spontaneous Combustion deals 3 damage to each creature.

Enchant creature
Enchanted creature gets +1/+1 and has lifelink and "Whenever this creature deals combat damage to a player, draw a card."

{3}{U}, {T}: Tap target creature.
{3}{B}, {T}: Destroy target tapped creature.

Enrage — Whenever Stalwart Speartail is dealt damage, other Dinosaurs you control and Dinosaur cards in your hand and library perpetually get +1/+1.
Whenever Stalwart Speartail attacks, you may pay {3}. When you do, Stalwart Speartail deals 1 damage to each creature and each planeswalker.

Haste
Whenever Stampede Surfer attacks, for each opponent, you create a 2/2 green Boar creature token that's tapped and attacking that opponent.

When Stangg enters, create Stangg Twin, a legendary 3/4 red and green Human Warrior creature token. Exile that token when Stangg leaves the battlefield. Sacrifice Stangg when that token leaves the battlefield.

Whenever Stangg, Echo Warrior attacks, create Stangg Twin, a legendary 3/4 red and green Human Warrior creature token. It enters tapped and attacking. For each Aura and Equipment attached to Stangg, create a token that's a copy of it attached to Stangg Twin. Sacrifice all tokens created this way at the beginning of the next end step.

First strike
When Steel Leaf Paladin enters, return a green or white creature you control to its owner's hand.

Enchant creature
As long as enchanted creature is white, it gets +1/+1 and has lifelink.
As long as enchanted creature is blue, it gets +1/+1 and can't be blocked.

Equipped creature gets +2/+2.
Equip Knight {1}
Equip {3}

As Stenn, Paranoid Partisan enters, choose a card type other than creature or land.
Spells you cast of the chosen type cost {1} less to cast.
{1}{W}{U}: Exile Stenn. Return it to the battlefield under its owner's control at the beginning of the next end step.

Other enchantments you control have shroud.
{1}, Sacrifice Sterling Grove: Search your library for an enchantment card, reveal it, then shuffle and put that card on top.

Vigilance
{T}: Add {G}.

When Stimulus Package enters, create two Treasure tokens.
Sacrifice a Treasure: Create a 1/1 green and white Citizen creature token.

When Stimulus Package enters, create two Treasure tokens.
Sacrifice a Treasure: Create a 1/1 green and white Citizen creature token. Scry 1.

Flying
When Stone Drake enters the battlefield, choose one —
• Distract — Tap target land. Draw a card.
• Enthrall — Target player discards a card for each spell you've cast this turn.

Trample
Whenever a creature you control with trample attacks, it gets +2/+2 until end of turn.

{2}, Discard a card at random: Stormbind deals 2 damage to any target.

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

{1}, Sacrifice another creature or artifact: Put a +1/+1 counter on Stormclaw Rager and draw a card. Activate only as a sorcery.

Menace
At the beginning of your upkeep, each player draws a card and loses 1 life.

Vigilance, trample
Grenades! — {2}, {T}, Sacrifice an artifact: Choose a player at random. When you do, Strax fights another target creature that player controls.
Glory of Battle — Whenever Strax deals damage to a creature, put a +1/+1 counter on Strax.

Flying
At the beginning of your end step, create a Blood token for each player who lost life this turn.
Whenever Strefan attacks, you may sacrifice two Blood tokens. If you do, you may put a Vampire card from your hand onto the battlefield tapped and attacking. It gains indestructible until end of turn.

Enchant creature
Enchanted creature gets +1/+1 for each creature and/or enchantment you control.