Torch Fiend

{R}, Sacrifice this creature: Destroy target artifact.

Evolving Wilds

{T}, Sacrifice this land: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.

Embermaw Hellion

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
If another red source you control would deal damage to a permanent or player, it deals that much damage plus 1 to that permanent or player instead.

Pitchburn Devils

When this creature dies, it deals 3 damage to any target.

Traitorous Blood

Gain control of target creature until end of turn. Untap it. It gains trample and haste until end of turn.

Irreverent Gremlin

Menace (This creature can't be blocked except by two or more creatures.)
Whenever another creature you control with power 2 or less enters, you may discard a card. If you do, draw a card. Do this only once each turn.

Festival Crasher

Whenever you cast an instant or sorcery spell, this creature gets +2/+0 until end of turn.

Mountain

Razorkin Hordecaller

Haste
Whenever you attack, create a 1/1 red Gremlin creature token.

Akoum Hellhound

Landfall — Whenever a land you control enters, this creature gets +2/+2 until end of turn.

Smash to Smithereens

Destroy target artifact. Smash to Smithereens deals 3 damage to that artifact's controller.

Sower of Chaos

{2}{R}: Target creature can't block this turn.

Into the Maw of Hell

Destroy target land. Into the Maw of Hell deals 13 damage to target creature.

Forge Devil

When this creature enters, it deals 1 damage to target creature and 1 damage to you.