Goblin Spelunkers

Mountainwalk (This creature can’t be blocked as long as defending player controls a Mountain.)

Endless Wurm

Trample
At the beginning of your upkeep, sacrifice Endless Wurm unless you sacrifice an enchantment.

Barrin’s Codex

At the beginning of your upkeep, you may put a page counter on Barrin’s Codex.
, , Sacrifice Barrin’s Codex: Draw X cards, where X is the number of page counters on Barrin’s Codex.

Verdant Force

At the beginning of each upkeep, create a 1/1 green Saproling creature token.

Gus

Gus enters the battlefield with a +1/+1 counter on it for each Magic game you have lost to one of your opponents since you last won a game against them.

Eye Spy

Look at the top card of target player’s library. You may put that card into their graveyard.

Remove

Cast this spell only during the declare attackers step and only if you’ve been attacked this step.
Return target attacking creature to its owner’s hand.

Goblin Mountaineer

Mountainwalk (This creature can’t be blocked as long as defending player controls a Mountain.)

Scare Tactics

Creatures you control get +1/+0 until end of turn.

Workhorse

Workhorse enters the battlefield with four +1/+1 counters on it.
Remove a +1/+1 counter from Workhorse: Add .

Cat Burglar

, : Target player discards a card. Activate this ability only any time you could cast a sorcery.

Null Brooch

, , Discard your hand: Counter target noncreature spell.

Medicine Bag

, , Discard a card: Regenerate target creature.

Wayward Soul

Flying
: Put Wayward Soul on top of its owner’s library.

Jinxed Ring

Whenever a nontoken permanent is put into your graveyard from the battlefield, Jinxed Ring deals 1 damage to you.
Sacrifice a creature: Target opponent gains control of Jinxed Ring. (This effect lasts indefinitely.)

Verdant Touch

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Target land becomes a 2/2 creature that’s still a land. (This effect lasts indefinitely.)

Lab Rats

Buyback (You may pay an additional as you cast this spell. If you do, put this card into your hand as it resolves.)
Create a 1/1 black Rat creature token.