Merfolk of the Depths

Flash (You may cast this spell any time you could cast an instant.)

Sorrow's Path

{T}: Choose two target blocking creatures controlled by the same opponent. If each of those creatures could block all creatures that the other is blocking, remove both of them from combat. Each one then blocks all creatures the other was blocking.
Whenever Sorrow's Path becomes tapped, it deals 2 damage to you and each creature you control.

Assembly Hall

{4}, {T}: Reveal a creature card in your hand. Search your library for a card with the same name as that card, reveal it, put it into your hand, then shuffle.

Acidic Dagger

{4}, {T}: Whenever target creature deals combat damage to a non-Wall creature this turn, destroy that non-Wall creature. When the targeted creature leaves the battlefield this turn, sacrifice Acidic Dagger. Activate only before blockers are declared.

Rite of the Serpent

Destroy target creature. If that creature had a +1/+1 counter on it, create a 1/1 green Snake creature token.

Accursed Centaur

When Accursed Centaur enters, sacrifice a creature.

Fatal Mutation

Enchant creature
When enchanted creature is turned face up, destroy it. It can't be regenerated.

Vanquish the Foul

Destroy target creature with power 4 or greater. Scry 1. (Look at the top card of your library. You may put that card on the bottom.)

Call for Blood

As an additional cost to cast this spell, sacrifice a creature.
Target creature gets -X/-X until end of turn, where X is the sacrificed creature's power.

Dredge

Sacrifice a creature or land.
Draw a card.

Gnarled Effigy

{4}, {T}: Put a -1/-1 counter on target creature.

Urza's Factory

{T}: Add {C}.
{7}, {T}: Create a 2/2 colorless Assembly-Worker artifact creature token.

Urza's Armor

If a source would deal damage to you, prevent 1 of that damage.

Addle

Choose a color. Target player reveals their hand and you choose a card of that color from it. That player discards that card.

Harbor Guardian

Reach (This creature can block creatures with flying.)
Whenever Harbor Guardian attacks, defending player may draw a card.

Molten-Tail Masticore

At the beginning of your upkeep, sacrifice Molten-Tail Masticore unless you discard a card.
{4}, Exile a creature card from your graveyard: Molten-Tail Masticore deals 4 damage to any target.
{2}: Regenerate Molten-Tail Masticore.

Archangel's Light

You gain 2 life for each card in your graveyard, then shuffle your graveyard into your library.

Delif's Cone

{T}, Sacrifice Delif's Cone: This turn, when target creature you control attacks and isn't blocked, you may gain life equal to its power. If you do, it assigns no combat damage this turn.

Gustha's Scepter

{T}: Exile a card from your hand face down. You may look at it for as long as it remains exiled.
{T}: Return a card you own exiled with Gustha's Scepter to your hand.
When you lose control of Gustha's Scepter, put all cards exiled with Gustha's Scepter into their owner's graveyard.

Delif's Cube

{2}, {T}: This turn, when target creature you control attacks and isn't blocked, it assigns no combat damage this turn and you put a cube counter on Delif's Cube.
{2}, Remove a cube counter from Delif's Cube: Regenerate target creature.

Evermind

(Nonexistent mana costs can't be paid.)
Draw a card.
Splice onto Arcane {1}{U} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

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