The best burn spells ever printed are red spells, but there are also plenty of ways to generate mana, some chaotic spells, and a surprising amount of countermagic
Moreover, when Ugin's +1 ability is activated, you not only get a 2/2 Spirit but also card advantage upon that token's demise
Its quite possible to have a pure UG deck (and I think theyre scarier on average than pure UR), but more often than not there will be at least a third color added to fit in more removal, and the five-color version might be most popular of all
Here is the complete card list of SV6a 'Night Wanderer': If you are on a PC, you can Right-Click the Image and choose 'Open Image in New Tab' for the bigger picture
If nothing else, it will be a nice excuse to dust off a Rakshasa Vizier and Rakshasa Deathdealer
Token engines, or cards that produce tokens multiple times throughout a game, can expand the total damage these pump spells deal