mtg.wtf

Whenever you cast an instant or sorcery spell, Spellrune Howler gets +2/+2 until end of turn.
Nightbound

Whenever you cast an instant or sorcery spell, Spellrune Painter gets +1/+1 until end of turn.
Daybound

When Spellseeker enters the battlefield, you may search your library for an instant or sorcery card with mana value 2 or less, reveal it, put it into your hand, then shuffle.

Whenever a player casts a spell, Spellshock deals 2 damage to that player.

Imprint — When Spellweaver Helix enters the battlefield, you may exile two target sorcery cards from a single graveyard.
Whenever a player casts a card, if it has the same name as one of the cards exiled with Spellweaver Helix, you may copy the other. If you do, you may cast the copy without paying its mana cost.

When Spelunking enters the battlefield, draw a card, then you may put a land card from your hand onto the battlefield. If you put a Cave onto the battlefield this way, you gain 4 life.
Lands you control enter the battlefield untapped.

You gain X life and draw X cards.

Whenever you draw a card, target opponent mills two cards. If two nonland cards that share a color were milled this way, repeat this process.
{5}{U}: Draw a card, then discard a card.

Destroy up to one target artifact, enchantment, or creature with flying. Create a Food token.

Creatures you control get +0/+1 and have reach.

When Spiderwig Boggart enters the battlefield, target creature gains fear until end of turn.

Untap target creature. It gets +2/+4 and gains reach until end of turn.

Spike Cannibal enters the battlefield with a +1/+1 counter on it.
When Spike Cannibal enters the battlefield, move all +1/+1 counters from all creatures onto it.

Spike Feeder enters the battlefield with two +1/+1 counters on it.
{2}, Remove a +1/+1 counter from Spike Feeder: Put a +1/+1 counter on target creature.
Remove a +1/+1 counter from Spike Feeder: You gain 2 life.

Spike Rogue enters the battlefield with two +1/+1 counters on it.
{2}, Remove a +1/+1 counter from Spike Rogue: Put a +1/+1 counter on target creature.
{2}, Remove a +1/+1 counter from a creature you control: Put a +1/+1 counter on Spike Rogue.

Spike Worker enters the battlefield with two +1/+1 counters on it.
{2}, Remove a +1/+1 counter from Spike Worker: Put a +1/+1 counter on target creature.

Equipped creature gets +3/+3.
Whenever equipped creature attacks, you may sacrifice a Forest. If you do, that creature gains trample until end of turn.
Equip {3}

{R}, {T}: Spikeshot Goblin deals damage equal to its power to any target.

Flying
Sacrifice Spiketail Drakeling: Counter target spell unless its controller pays {2}.

{R}: Target creature can't block Spin Engine this turn.

When Spinal Centipede dies, put a +1/+1 counter on target creature you control.

{T}: Destroy target blue creature.

Morph {2}{B}

When Spined Fluke enters the battlefield, sacrifice a creature.
{B}: Regenerate Spined Fluke.