I wanted to start this thread for all of those who like to discuss the roles some of the new cards will have in the standard format. Especially since those good people at MtgSalvation.com have the entire Morningtide spoiler up now. Some of the chase cards with higher value (on eBay now) are Chameleon Colossus, Murmuring Bosk, Mutavault, Countryside Crusher and Bitterblossom. I have listed their information below. I wanted to gather opinions on how these specific cards would fit into the current standard format. Fell free to comment on any possible sleeper cards, that may peak in value later on (ex. Tarmogoyf). If anyone wants to comment on the predicted cards value long term (when they phase out of standard play), that would also be interesting. Thanks!
Chameleon Colossus

Rare
Creature - Shapeshifter
Changeling (This card is every creature type at all times)
Protection from Black
2

: Chameleon Colossus gets +X/+X until end of turn, where X is equal to its power.
Illus. Darrell Riche #116/150 4/4
Murmuring Bosk Rare
Land - Forest
(

: Add

to your mana pool.)
As Murmuring Bosk comes into play, you may reveal a Treefolk card from your hand. If you don't, Murmuring Bosk comes into play tapped.

: Add

or

to your mana pool. Murmuring Bosk deals 1 damage to you.
#147/150
Mutavault Rare
Land

: Add

to your mana pool.

: Mutavault becomes a 2/2 creature with all creature types until end of turn. It's still a land.
Some changelings born at Velis Vel never return, but their essence never leaves.
Illus. Fred Fields #148/150
Countryside Crusher

Rare
Creature - Giant Warrior
At the beginning of your upkeep, reveal the top card of your library. If it's a land card, put it into your graveyard and repeat this process.
Whenever a land card is put into your graveyard from anywhere, put a +1/+1 counter on Countryside Crusher.
3/3
Bitterblossom

Tribal Enchantment - Faerie
At the beginning of your upkeep, lose 1 life and put a 1/1 black Faerie Rogue creature token with flying into play.
Illus. Rebecca Guay #58/150