Guttersnipe

Whenever you cast an instant or sorcery spell, this creature deals 2 damage to each opponent.

Demand Answers

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

Judith, Carnage Connoisseur

Whenever you cast an instant or sorcery spell, choose one —
• That spell gains deathtouch and lifelink.
• Create a 2/2 red Imp creature token with "When this creature dies, it deals 2 damage to each opponent."

Swamp

Blazing Volley

Blazing Volley deals 1 damage to each creature your opponents control.

Rakdos Guildgate

This land enters tapped.
{T}: Add {B} or {R}.

Mountain

Tectonic Hazard

Tectonic Hazard deals 1 damage to each opponent and each creature they control.