Raging Goblin

Haste (This creature can attack and {T} as soon as it comes under your control.)

Kyren Glider

Whenever this creature deals damage to a player, you may put a Goblin permanent card from your hand onto the battlefield.

Flame Burst deals X damage to any target, where X is 2 plus the number of cards named Flame Burst in all graveyards.

You may sacrifice two Mountains rather than pay this spell's mana cost.
Create two 1/1 red Goblin creature tokens.

Other Goblins get +1/+1 and have mountainwalk.

Lightning Bolt deals 3 damage to any target.

Goblin spells you cast cost {1} less to cast.
Goblins you control have haste.

{T}, Pay 1 life, Sacrifice this land: Search your library for a Swamp or Mountain card, put it onto the battlefield, then shuffle.

When this creature enters, you may search your library for a Goblin card, reveal that card, put it into your hand, then shuffle.

Haste
Reckless One's power and toughness are each equal to the number of Goblins on the battlefield.