Up until recently the previews for this set have been relatively disappointing in terms of Type 4 playables, but now there are a few cards which will most likely make the cut in all stacks. Such as.....
Guile
3uuu
Creature – Elemental Incarnation
Guile can't be blocked except by three or more creatures.
If a spell or ability you control would counter a spell, instead remove that spell from the game and you may play that card without paying its mana cost.
When guile is put into a graveyard from anywhere, shuffle it into its owner's library.
6/6
Rare.
This guy seems absolutely ridiculous, and almost guaranteed to make it into almost any stack (except for possibly mine where I choose to not use ACCs). Not much more to say about this one.Cryptic Command
1uuu
Instant Rare
Choose two - Counter target spell; or return target permanent to its owner's hand; or tap all creatures your opponents control; or draw a card.
Illus. Wayne England #56/301
Another auto-include into just about every stack. Dismiss with benefits is okay in my book. Chandra Nalaar
3rr
Planeswalker - Chandra Rare
+1: Chandra Nalaar deals 1 damage to target player.
-X: Chandra Nalaar deals X damage to target creature.
-8: Chandra Nalaar deals 10 damage to target player and each creature he or she controls.
Illus. Aleksi Briclot #159/301 6
I don't know if the planeswalkers are good enough or not, but if any are, this one seems to be the best one for Type 4 (though Vess does seem pretty good for this format as well). Wild Ricochet
2rr
Instant Rare
You may choose new targets for target instant or sorcery spell. Then copy that spell. You may choose new targets for the copy.
Fork + Shunt = Spot in Type 4 stacks. Wydwen, the Biting Gale
2ub
Legendary Creature - Faerie Wizard Rare
Flash
Flying


, Pay 1 life: Return Wydwen, the Biting Gale to its owner's hand.
3/3
I don't know if she is good enough, but Flash on anything decent turns it up a notch in this formatRings of Brighthearth
3
Artifact Rare
Whenever you play an activated ability, if it isn't a mana ability, you may pay 2. If you do, you may copy that ability. You may choose new targets for that copy.
"Without flame, there would be no iron tools, no cooked meals, no purge of old growth to make room for new."
-Brighthearth Creen
Illus. Howard Lyon #259/301
While it's probably too limited since it's useless with infinite abilities like Masticores, it does good things with Mindslavers and Doors. Mosswort Bridge
Land Rare
Hideaway (This land comes into play tapped. When it does, look at the top 4 cards of your library, remove one from the game face down, then put the rest on the bottom of your library.)

: Add

to your mana pool.

,{T}: You may play the removed card without paying its mana cost if creatures you control have a total power of 10 or greater.
Illus. Jeremy Jarvis
For those of you who play with ACC rules, this one could be a HUGE addition, since as soon as you resolve some fat you get that mystery card for free.