Jeff Laubenstein

Interdict

Counter target artifact, creature, enchantment, or land ability requiring an activation cost. Abilities of that permanent cannot be played again this turn. 
Draw a card.

Counter target activated ability from an artifact, creature, enchantment, or land. That permanent's activated abilities can't be activated this turn. (Mana abilities can't be targeted.)
Draw a card.

Goblin Bombardment

Sacrifice a creature: This enchantment deals 1 damage to any target.

Treefolk

Omni-Changeling

Changeling (This card is every creature type.)
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
You may have this creature enter as a copy of any creature on the battlefield, except it has changeling.

Kithkin

The knight was irritated when her rations went missing and truly baffled when her weapons started disappearing too.

Chomping Changeling

Changeling (This card is every creature type.)
When this creature enters, destroy up to one target artifact or enchantment.

"One would think I would be accustomed to unexpected returns."
—Hanna, *Weatherlight* navigator

Clot Sliver

All Slivers have "{2}: Regenerate this permanent."

Saproling

Dauthi Horror

Shadow (This creature can block or be blocked by only creatures with shadow.)
This creature can't be blocked by white creatures.

MORE TO LOVE: Friendly, nature-loving, Bunyonesque SEM seeks SEF looking for a huge commitment. . . . seeks atog prince

Growth Spurt

Roll a six-sided die. Target creature gets +X/+X until end of turn, where X is the result.

It possesses no intelligence, only counter-intelligence.

Scragnoth

This spell can't be countered.
Protection from blue

Vine Dryad

You may exile a green card from your hand rather than pay this spell's mana cost.
Flash
Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)

Shed harpy feathers leave painful wounds—which explains the harpies' mood.

Molting Harpy

Flying
At the beginning of your upkeep, sacrifice this creature unless you pay {2}.

Sometimes the mountain takes.
—Keldon saying

Landslide

Sacrifice any number of Mountains. Landslide deals that much damage to target player or planeswalker.

Incendiary

Enchant creature
At the beginning of your upkeep, you may put a fuse counter on this Aura.
When enchanted creature dies, this Aura deals X damage to any target, where X is the number of fuse counters on this Aura.

Goblin Festival

{2}: This enchantment deals 1 damage to any target. Flip a coin. If you lose the flip, choose one of your opponents. That player gains control of this enchantment.

Toward the end, Gatha struggled to keep his experiments in and his patrons out.

Caltrops

Whenever a creature attacks, this artifact deals 1 damage to it.

Miscalculation

Counter target spell unless its controller pays {2}.
Cycling {2} ({2}, Discard this card: Draw a card.)

Martyr's Cause

Sacrifice a creature: The next time a source of your choice would deal damage to any target this turn, prevent that damage.

"First, do some harm."
—Oath of Goblins

Goblin Medics

Whenever this creature becomes tapped, it deals 1 damage to any target.

Delusions of Mediocrity

When this enchantment enters, you gain 10 life.
When this enchantment leaves the battlefield, you lose 10 life.

At the academy, "show and tell" too often becomes "run and hide."

Show and Tell

Each player may put an artifact, creature, enchantment, or land card from their hand onto the battlefield.

Metrognome

When a spell or ability an opponent controls causes you to discard this card, create four 1/1 colorless Gnome artifact creature tokens.
{4}, {T}: Create a 1/1 colorless Gnome artifact creature token.

Start with eleven gnomes and a room of parts, and come morning you'll have ten and a monster the likes of which you've never seen.

Copper Gnomes

{4}, Sacrifice this creature: You may put an artifact card from your hand onto the battlefield.

"That was fun! Now me."
—Gwendlyn Di Corci

Handcuffs

As this enchantment enters, choose a player.
When the chosen player's hands aren't touching each other, sacrifice this enchantment and that player sacrifices three permanents.

Double Cross

Choose another player. Look at that player's hand and choose a card other than a basic land card from it. They discard that card. At the beginning of the first upkeep in your next game with that player, look at that player's hand and choose a card other than a basic land card from it. They discard that card.

"I am confined by sleep and defined by nightmare."
—Crovax

Recurring Nightmare

Sacrifice a creature, Return this enchantment to its owner's hand: Return target creature card from your graveyard to the battlefield. Activate only as a sorcery.

How do you map a world when the land moves beneath your feet?

Cartographer

When this creature enters, you may return target land card from your graveyard to your hand.

Mogg Hollows

{T}: Add {C}.
{T}: Add {R} or {G}. This land doesn't untap during your next untap step.

Apes of Rath

Whenever this creature attacks, it doesn't untap during its controller's next untap step.