Mountain

Maniacal Rage

Enchant creature
Enchanted creature gets +2/+2 and can't block.

Skyline Scout

Whenever Skyline Scout attacks, you may pay {1}{W}. If you do, it gains flying until end of turn.

Candlelight Vigil

Enchant creature
Enchanted creature gets +3/+2 and has vigilance.

Boros Guildgate

Boros Guildgate enters tapped.
{T}: Add {R} or {W}.

Stone Quarry

Stone Quarry enters tapped.
{T}: Add {R} or {W}.

Skittering Surveyor

When Skittering Surveyor enters, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Take Heart

Target creature gets +2/+2 until end of turn. You gain 1 life for each attacking creature you control.

Loxodon Restorer

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
When Loxodon Restorer enters, you gain 4 life.

Fire Urchin

Trample
Whenever you cast an instant or sorcery spell, Fire Urchin gets +1/+0 until end of turn.

Direct Current

Direct Current deals 2 damage to any target.
Jump-start (You may cast this card from your graveyard by discarding a card in addition to paying its other costs. Then exile this card.)

Boros Challenger

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)
{2}{R}{W}: Boros Challenger gets +1/+1 until end of turn.

Righteous Blow

Righteous Blow deals 2 damage to target attacking or blocking creature.

Cosmotronic Wave

Cosmotronic Wave deals 1 damage to each creature your opponents control. Creatures your opponents control can't block this turn.

Skyscanner

Flying
When Skyscanner enters, draw a card.

Barging Sergeant

Haste
Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

Hunted Witness

When Hunted Witness dies, create a 1/1 white Soldier creature token with lifelink.