I think that what you're referring to as "sac lands" should be referred to as "Fetch Lands".
It seems to me that you essentially replaced the "Tier 2" burn spells (e.g. Flame Rift, Magma Jet, or even Keldon Marauders) with Delver of Secrets and Brainstorm, which might actually be a good idea. With the small number of cards that you're splashing for, the following points are probably the ones that you'd need to consider:
- Do the benefits of splashing for these cards outweigh the trade-off of weakening your manabase?
- Whenever you have these cards in your hand, try to determine if you would be better-off with one of the Tier 2 burn spells you've replaced.
- The cards that you're trying to splash for are definitely good cards, but you have to consider if these cards really add to what you're trying to achieve as a burn deck.
Personally, I think that you're going to win a lot of games with this configuration, but I find it likely that these games would still be probably won had you used burn spells instead (and avoiding the drawbacks of splashing for a color).
The SB is a different story though. If you can justify splashing blue to get access to SB cards that would otherwise be inaccessible, then the splash might be worth considering. For example, more Spell Pierce might be useful.
For the last singleton card, an alternative could be Shard Volley. Think of it as the 5th Fireblast. I personally do have that card as a singleton in my configuration.
Kind Regards,
jares

