While both are Rank 5 monsters that require two Level 5 monsters as Xyz Materials, the former has more DEF than ATK and a purely supportive effect, while the latter has more ATK than DEF and an offensive and destructive effect
That being said, I have seen many games end with a few rounds of each player using this card
The gold cards are special gold holofoil cards that give off a shimmering appearance when held underneath the light
Heliod, the Radiant Dawn / Heliod, the Warped Eclipse Heliod, the Radiant Dawn is just an oversized Auramancer, but transform this baddie and you get Heliod, the Warped Eclipse, a Phyrexian god that converts opponents card draw into cost reduction for your spells
How you display your cards in your sales post (or even on ebay) can make a huge difference in how much you sell
GX Tag Force 2 , or by completing all Challenges