Red
- Forgestoker Dragon replacing Charmbreaker Devils
- Impetuous Sunchaser replacing Foundry Street Denizen
I decided to remove Foundry Street Denizen because I removed a lot of the cards that made the goblin more effective (Goblin Rally and Krenko's Command). Impetuous Sunchaser is still aggressive and with the right auras can be quite scary.
White
- Akroan Skyguard replacing Phalanx Leader
- Loyal Pegasus replacing Daring Skyjek
- Ornitharch replacing Knight Watch
Loyal Pegasus added more consistent aggressive evasion as it only requires 1 other creature instead of 2 other creatures. It does kind of become useless though if it's the only creature you have but in an aggressive weenie deck, that probably won't be likely.
I liked Ornitharch at the pre-release. Either it's a 5/5 flyer or a 3/3 flyer and 2 1/1 flyers. Both forms are good in my opinion.
Green
- Courser of Kruphix replacing Battering Krasis
- Fated Intervention replacing Nemesis of Mortals
- Raised by Wolves replacing Moldgraf Monstrosity
- Karametra's Favor replacing Gatecreeper Vine
I like tokens and Fated Intervention is one heck of a token generator. Instant speed for surprise blockers or if played on your turn can help smooth out your draws.
Raised by Wolves provides more tokens and another useful aura. Should make heroic decks easier to build with more auras. Also it goes well with Howl of the Night Pack.
Karametra's Favor pretty much does everything Gatecreeper Vine does and then some. The aura ramps and is a decent heroic trigger. Does dilute the defender theme a bit so makes Overgrown Battlement and Axebane Guardian slightly worse but I think the trade-off is fine.
Black
- Herald of Torment replacing Arrogant Bloodlord
Blue
- Thassa's Rebuff replacing Simic Fluxmage
- Sudden Storm replacing Frost Breath
Although Sudden Storm isn't strictly better than Frost Breath, I felt the scry addition is powerful enough to make the swap.
Other
- Chromanticore replacing Ulamog's Crusher
- Graverobber Spider replacing Korozda Gorgon
I was never fully happy with Korozda Gorgon as it's ability depended a lot on whether you could get enough scavenge or green evolve creatures. With Graverobber Spider you can at least use its ability without depending on anything else other than creatures dying (and creatures will die).
I managed to pick up 2 of the 3 temples for this set at the pre-release but I haven't included them in just yet. I'm probably going to wait until I have all 10 temples (currently I have 7 of 8) before trying to figure out how to include them. I currently have all the Keyrunes and Cluestones slated to be replaced by the temples but I'm not sure about that. I really want a way to fit the Keyrunes/cluestones and the temples so I can have lots of colour fixing and some acceleration.
There are a few other cards from Born of the Gods that I would like to add to my cube but I will have to wait until the set is fully released before I can pick them up.