Impending Doom

Enchant creature
Enchanted creature gets +3/+3 and attacks each combat if able.
When enchanted creature dies, this Aura deals 3 damage to that creature's controller.

Mountain

Aftershock

Destroy target artifact, creature, or land. Aftershock deals 3 damage to you.

Goblin Artillery

{T}: This creature deals 2 damage to any target and 3 damage to you.

Sarkhan's Rage

Sarkhan's Rage deals 5 damage to any target. If you control no Dragons, Sarkhan's Rage deals 2 damage to you.

Auntie Blyte, Bad Influence

Flying
Whenever a source you control deals damage to you, put that many +1/+1 counters on Auntie Blyte.
{1}{R}, {T}, Remove X +1/+1 counters from Auntie Blyte: It deals X damage to any target.

Thriving Bluff

This land enters tapped. As it enters, choose a color other than red.
{T}: Add {R} or one mana of the chosen color.

Ravenous Giant

At the beginning of your upkeep, this creature deals 1 damage to you.

Spear Spewer

Defender
{T}: This creature deals 1 damage to each player.

Coalhauler Swine

Whenever this creature is dealt damage, it deals that much damage to each player.

Fireslinger

{T}: This creature deals 1 damage to any target and 1 damage to you.

Smoldering Efreet

When this creature dies, it deals 2 damage to you.

Loxodon Warhammer

Equipped creature gets +3/+0 and has trample and lifelink.
Equip {3}

Goblin Psychopath

Whenever this creature attacks or blocks, flip a coin. If you lose the flip, the next time it would deal combat damage this turn, it deals that damage to you instead.