Having only made one marginally effective deck with them, I approve of this change. Getting free 4/3s is better then 1 cost 4/3s :p Auto mulligan aside, that is always a concern for 0 costs though.
That's the problem. Skeletal decks with Eclipse would be too powerful (or "playable" if you prefer), thus nerfing Photon too much (it is the only unupped creature that costs nothing) in addition of nerfing Boneyard|Graveyard because it would be much more effective to just pack 6 Skellies.
In other words, I am completely AGAINST this buff:
* It claim Photon's true power of costing nothing.
* Skeletons were meant to be spammed via Boneyard or even Skull Shield and it should remain like this.
* Undead is a passive which 'protects' Skeletons from a very common and powerful CC; Reverse Time. Moreover, you can pack an Eternity to give yourself a 'mutant' army.
* Skeletons are buffed by Nightfall|Eclipse; this alone makes it clear Skeletons shouldn't cost nothing.
* This change wouldn't buff the element of
. The true buffed elements would be
and
, because they would be able to use Skeleton heavy comboes with only
and
quanta resources.