Pestilence

At the beginning of the end step, if no creatures are on the battlefield, sacrifice Pestilence.
{B}: Pestilence deals 1 damage to each creature and each player.

Diabolic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Dark Ritual

Lightning Bolt

Lightning Bolt deals 3 damage to any target.

Walk the Plank

Badlands

Dragonskull Summit

Dragonskull Summit enters the battlefield tapped unless you control a Swamp or a Mountain.
{T}: Add {B} or {R}.

Swamp

Sun-Crowned Hunters

Enrage — Whenever Sun-Crowned Hunters is dealt damage, it deals 3 damage to target opponent or planeswalker.

Lotus Petal

{T}, Sacrifice Lotus Petal: Add one mana of any color.

Basalt Monolith

Basalt Monolith doesn't untap during your untap step.
{T}: Add {C}{C}{C}.
{3}: Untap Basalt Monolith.

Red Elemental Blast

Choose one —
• Counter target blue spell.
• Destroy target blue permanent.