Catalyst Elemental

Sacrifice Catalyst Elemental: Add {R}{R}.

Goblin Anarchomancer

Each spell you cast that's red or green costs {1} less to cast.

Forest

Grinning Ignus

{R}, Return Grinning Ignus to its owner's hand: Add {C}{C}{R}. Activate only as a sorcery.

Mountain

Akki Rockspeaker

Coal Stoker

When Coal Stoker enters, if you cast it from your hand, add {R}{R}{R}.

Impact Tremors

Whenever a creature you control enters, this enchantment deals 1 damage to each opponent.

Brighthearth Banneret

Elemental spells and Warrior spells you cast cost {1} less to cast.
Reinforce 1—{1}{R} ({1}{R}, Discard this card: Put a +1/+1 counter on target creature.)

Soulbright Flamekin

{2}: Target creature gains trample until end of turn. If this is the third time this ability has resolved this turn, you may add {R}{R}{R}{R}{R}{R}{R}{R}.

Thornscape Familiar

Red spells and white spells you cast cost {1} less to cast.

Manamorphose

Add two mana in any combination of colors.
Draw a card.