Oath of the Gatewatch: Even More Spoilers!

 Reckless Bushwhacker (2R)
 Creature - Goblin Warrior Ally
 Surge {1R} (You may cast this spell for its surge cost if you or a teammate has cast another spell this turn.)
Haste
When Reckelss Bushwhacker enters the battlefield, if its surge cost was paid, other creatures you control get +1/+0 and gain haste until end of turn.

Deepfoam Skulker (5U)
Creature - Eldrazi
Devoid (This card has no color.)
Whenever a creature you control deals combat damage to a player, you may draw a card.
{3C}: Target creature can't be blocked this turn.

Dread Defiler (6B)
Creature - Eldrazi
Devoid (This card has no color.)
{3C}, Exile a creature card from your graveyard: Target opponent loses life equal to the exiled card's power.
It left behind an echoing emptiness more horrible than the grave.

So far, this has got to be my most favorite card in the set. Imagine putting the Dread Defiler in a heavy-beatdown deck, for example with a green-black demons deck? Imagine pairing this with something like Doomgape.

Stone Haven Outfitter (1W)
Creature - Kor Artificer Ally
Equipped creatures you control get +1/+1.
Whenever an equipped creature you control dies, draw a card.
The makers and menders are the first called to battle and the last to leave.

This only hints at an equipment-ally intro deck. I guarantee it.