Here is the first batch of spoilers officially from Wizards of the Coast for Rise of the Eldrazi. These were distributed to numerous Magic sites, blogs and a few non-Magic gaming sites to be released simultaneously on March 15th at 12:00am EST. Which has now passed. Be sure to check out our Rise of the Eldrazi Spoiler page!
[easybox]Corpsehatch {3}{B}{B}
Sorcery
Destroy target nonblack creature.
Put two 0/1 colorless Eldrazi Spawn creature tokens onto the battlefield. They have "Sacrifice this creature: Add {1} to your mana pool."
Artist: Kekai Kotaki
#103/248
Uncommon[/easybox]
[easybox]Mammoth Umbra {4}{W}
Enchantment - Aura
Enchant Creature
Enchanted creature gets +3/+3 and has vigilance.
Totem armor (If enchanted creature would be destroyed, instead remove all damage from it and destroy this Aura.)
Artist: Howard Lyon
#37/248
Uncommon[/easybox]
[easybox]Mnemonic Wall {4}{U}
Creature - Wall
Defender
When Mnemonic Wall enters the battlefield, you may return target instant or sorcery from your graveyard to your hand.
0/4
Artist: Vance Kovacs
#78/248
Common[/easybox]
[easybox]Pathrazer of Ulamog {11}
Creature - Eldrazi
Annihilator 3 (Whenever this creature attacks, defending player sacrifices three permanents.)
Pathrazer of Ulamog can't be blocked except by three or more creatures.
No thought but hunger. No strategy but destruction.
9/9
Artist: Austin Hsu
#9/248
Uncommon[/easybox]
[easybox]Prey's Vengeance {G}
Instant
Target creature gets +2/+2 until end of turn.
Rebound (If you cast this spell from your hand, exile it as it resolves. At the beginning of your next upkeep, you may cast this card from exile without paying its mana cost.)
Artist: Jesper Ejsing
#205/248
Uncommon[/easybox]
[easybox]Valakut Fireboar {4}{R}
Creature - Elemental Boar
Whenever Valakut Fireboar attacks, switch its power and toughness until end of turn.
"Just move very slowly, and for the love of Ula, do not get it mad." - Chadir the Navigator
1/7
Artist: Zoltan Boros & Gabor Szikszai
#170/248
Uncommon[/easybox]