We plan to announce more details about the update as the dates for the addition of these features are finalized, so please look forward to it." It is unclear how trading will work in the mobile game, but it has been made clear that not all cards will be eligible to be traded, likely meaning some of the game's rarest cards will be exempt from being passed from player to player
River Song And then there were three
Now we're cooking with gas
While costing 8 CP unreduced, it still is actually an even trade often times because as second option discard can be selected
Legends that are only so on the back end are not included - so Sidequest: Hunt the Mark /// Yiazmat, Ultimate Mark isn't included, nor is the melded form of Ragnarok, Divine Deliverance though it is referenced on its constituent cards
Sylvan Library is the best at this as it's a two-mana Green enchantment that lets you draw the top three cards of your deck during your draw step