Angry Rabble

Trample
Whenever you cast a spell with mana value 4 or greater, this creature deals 1 damage to each opponent.
{5}{R}: Put two +1/+1 counters on this creature. Activate only as a sorcery.

Coal Stoker

When this creature enters, if you cast it from your hand, add {R}{R}{R}.

Unexpected Windfall

As an additional cost to cast this spell, discard a card.
Draw two cards and create two Treasure tokens. (They're artifacts with "{T}, Sacrifice this token: Add one mana of any color.")

Spider Manifestation

Reach
{T}: Add {R} or {G}.
Whenever you cast a spell with mana value 4 or greater, untap this creature.

Emrakul's Hatcher

When this creature enters, create three 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this token: Add {C}."

Forgotten Cave

This land enters tapped.
{T}: Add {R}.
Cycling {R} ({R}, Discard this card: Draw a card.)

Fire Diamond

This artifact enters tapped.
{T}: Add {R}.

Desperate Ritual

Add {R}{R}{R}.
Splice onto Arcane {1}{R} (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)

Lotus Petal

{T}, Sacrifice this artifact: Add one mana of any color.

Big Score

Rodeo Pyromancers

Whenever you cast your first spell each turn, add {R}{R}.

Rapacious One

Trample
Whenever this creature deals combat damage to a player, create that many 0/1 colorless Eldrazi Spawn creature tokens. They have "Sacrifice this token: Add {C}."

Mountain

Famished Foragers

When this creature enters, if an opponent lost life this turn, add {R}{R}{R}.
{2}{R}, Discard a card: Draw a card.