I figured I would help and post all of the images spoiled thus far.
Krond the Dawn-Clad [G G G W W W]
Legendary Creature - Archon [Mythic Rare]
Flying, vigilance
Whenever Krond the Dawn-Clad attacks, if it's enchanted, exile target permanent.
[6/6]


Dragonlair Spider [2 R R G G]
Creature - Spider [Rare]
Reach
Whenever an opponent casts a spell, put a 1/1 green Insect creature token onto the battlefield.
[5/6]
Brindle Shoat [1 G]
Creature - Boar [Uncommon]
When Brindle Shoat dies, put a 3/3 green Boar creature token onto the battlefield.
[1/1]
Preyseizer Dragon [4 R R]
Creature - Dragon [Rare]
Flying, Devour 2
Whenever Preyseizer Dragon attacks, it deals damage to target creature or player equal to the number of +1/+1 counters on Preyseizer Dragon.
[4/4]
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Planes
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Jund
Plane - Alara
Whenever a player casts a black, red, or green creature spell, it gains devour 5.
CHAOS: Whenever your roll CHAOS, put two 1/1 red Goblin creature tokens onto the battlefield.
Stairs to Infinity
Plane-Xerex
Players have no maximum hand size.
Whenever you roll the planar die, draw a card.
CHAOS: Whenever you roll CHAOS, reveal the top card of your planar deck. You may put it on the bottom of your planar deck.
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Phenomenon
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Spatial Merging
Phenomenon
When you encounter Spatial Merging, reveal cards from the top of your planar deck until you reveal two plane cards. Simultaneously planeswalk to both of them. Put all other cards revealed this way on the bottom of your planar deck in any order.
Time DistortionPhenomenon
When you encounter Time Distortion, reverse the game's turn order.