Mana Leak

Counter target spell unless its controller pays {3}.

Shivan Reef

{T}: Add {C}.
{T}: Add {U} or {R}. Shivan Reef deals 1 damage to you.

Whenever you cast an instant or sorcery spell, create a 1/1 red Elemental creature token.

Sulfur Falls enters tapped unless you control an Island or a Mountain.
{T}: Add {U} or {R}.

Lightning Bolt deals 3 damage to any target.

Counter target spell. If that spell is countered this way, put it into its owner's hand instead of into that player's graveyard.
Draw a card.

Whenever you cast a noncreature spell, create a 1/1 colorless Soldier artifact creature token.