Heartfire

As an additional cost to cast this spell, sacrifice a creature or planeswalker.
Heartfire deals 4 damage to any target.

Grab the Prize

As an additional cost to cast this spell, discard a card.
Draw two cards. If the discarded card wasn't a land card, Grab the Prize deals 2 damage to each opponent.

Dragon Fodder

Create two 1/1 red Goblin creature tokens.

Goblin Instigator

When Goblin Instigator enters, create a 1/1 red Goblin creature token.

Wild Guess

As an additional cost to cast this spell, discard a card.
Draw two cards.

Shock

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Goblin Gathering

Create a number of 1/1 red Goblin creature tokens equal to two plus the number of cards named Goblin Gathering in your graveyard.

Krenko's Command

Impact Tremors

Whenever a creature you control enters, this enchantment deals 1 damage to each opponent.