We have to discard 42 cards, but we get 15 bonus to add, and we salvage 12.
We have to use those 15 cards wisely.
My opinion on those 12 card is:
2xWings
3xThunderstorm
3xProtect Artifact
4x...
I'm OK with more wings, that allows me (us) to even make two wings decks if needed.
The Thunderstorms might be a bit useless however, as we could also use toadfishes or shockwaves.
We already have 3 EAs I don't think we need more of them, as they are of element.
We already have 6 miracles, so those aren't needed too, but adding 2 mirror shields and 2 mornings stars might help.
Another nice stall we can make is SS-tridents, but that would mean taking 4 to 6 stone skins, which might be a bit too much.
But we could do:
2x wings
2x mirror shield
2x morning star
4x stone skin
2x something
I got the idea of a deck like that when I was trying to come up with a deck that could beat the fire stall deck I faced, and I came up with something like:
3 trident
3 EA
3 Earthquake
6 Ice bolt (in case they take another deck, all fire creatures have low HP, so that will do)
2 Ice shield (taking less damage)
4 stone skin
And a lot of water pendulums, enough to prevent a deck out.