We know 4 (3 new) cards and each seems very playable to me:
Jace, the Mind Sculptor 2UU
Planeswalker
[+2]: Look at the top card of target player's library. You may put that card on the bottom of that player's library.
[+0]: Draw three cards, then put two cards from your hand on top of your library in any order.
[-1]: Return target creature to its owner's hand.
[-12]: Exile all cards from target player's library, then that player shuffles his or her hand into his or her library.
3
The best blue PW, what else can I say? Brainstorm for zero loyalty counters? OMGWTF I want this card! He starts on 5 counters with 4 from good to sick abilities, this means he´s probably the best walker EVER!!! Ultimate ability wins game by itself, yes, this is a Chase Rare!
Leatherback Baloth GGG
Creature - Beast
Vannila
4/5
Imho, this is very good card for MGA. 2nd tarmogoyf which wouldn´t be crippled by Relic of progenitus or any graveyard removal? I want playset of this (and Thibir too I think ).
Celestial Colonnade
Land
Celestial Colonnade enters the battlefield tapped.
T : Add U or E to your mana pool.
3UW: Until end of turn, Celestial Colonnade becomes a 4/4 white and blue Elemental creature with flying and vigilance. It's still a land.
Hmm, land which attack and could be used to produce mana after that, for example for StP or PtE on opponents Baneslayer or Tombstalker? Playable!
Jace, the Mind Sculptor 2UU
Planeswalker
[+2]: Look at the top card of target player's library. You may put that card on the bottom of that player's library.
[+0]: Draw three cards, then put two cards from your hand on top of your library in any order.
[-1]: Return target creature to its owner's hand.
[-12]: Exile all cards from target player's library, then that player shuffles his or her hand into his or her library.
3
The best blue PW, what else can I say? Brainstorm for zero loyalty counters? OMGWTF I want this card! He starts on 5 counters with 4 from good to sick abilities, this means he´s probably the best walker EVER!!! Ultimate ability wins game by itself, yes, this is a Chase Rare!
Leatherback Baloth GGG
Creature - Beast
Vannila
4/5
Imho, this is very good card for MGA. 2nd tarmogoyf which wouldn´t be crippled by Relic of progenitus or any graveyard removal? I want playset of this (and Thibir too I think ).
Celestial Colonnade
Land
Celestial Colonnade enters the battlefield tapped.
T : Add U or E to your mana pool.
3UW: Until end of turn, Celestial Colonnade becomes a 4/4 white and blue Elemental creature with flying and vigilance. It's still a land.
Hmm, land which attack and could be used to produce mana after that, for example for StP or PtE on opponents Baneslayer or Tombstalker? Playable!