Rampart Smasher

Rampart Smasher can't be blocked by Knights or Walls.

Forest

Wildfire

Each player sacrifices four lands of their choice. Wildfire deals 4 damage to each creature.

Llanowar Elves

Mountain

Radha, Heir to Keld

Whenever Radha, Heir to Keld attacks, you may add {R}{R}.
{T}: Add {G}.

Raze

As an additional cost to cast this spell, sacrifice a land.
Destroy target land.

Fire Diamond

Fire Diamond enters tapped.
{T}: Add {R}.

Roiling Terrain

Destroy target land, then Roiling Terrain deals damage to that land's controller equal to the number of land cards in that player's graveyard.

Acidic Slime

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Acidic Slime enters, destroy target artifact, enchantment, or land.

Winter's Grasp

Sundering Titan

When Sundering Titan enters or leaves the battlefield, choose a land of each basic land type, then destroy those lands.