Impact Tremors

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

Sol Ring

Whenever Krenko attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to Krenko's power.

Create two 1/1 red Goblin creature tokens.

{T}: Add one mana of any color in your commander's color identity.

Add {R} for each Goblin on the battlefield.

{T}: Create X 1/1 red Goblin creature tokens, where X is the number of Goblins you control.

Creatures you control have haste.
Legendary creatures you control get +1/+0.

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

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