WTF?
seriously WTF?
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(and level 1-4 spells are uber cheep with partially charged wands)
The ability according to pathfinder srd works with spell trigger items (such as wands), and spell completion items (such as scrolls). Thus it costs this amount to add the spell to the sorcerer's spells known (assuming no expensive gp components or xp components, using a spell made by a cleric that you bought at a market)
25gp- Level 1
150gp- Level 2
375gp- Level 3
700gp- Level 4
1125gp- Level 5
1650gp- Level 6
2275gp- Level 7
3000gp- Level 8
3825gp- Level 9
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You don't need any weird spell lists beyond normal cleric and normal druid with this ability to completely break it. You are a normal full spellcaster with your sorcerer spell slots, and as long as the spell is 1 lower than your max spell levels you can cast any cleric or druid spell spontaneously with no preparation. Just throw those scrolls into a bag of holding where it is a full round action to retrieve, or a move action via the infiinite scrollcase (can store up to 50 scrolls costs 2,800gp), or a move action for 10 scrolls via a belt of hidden pouches (5,000 gp) and a standard action for the remaining 20 scrolls.
Spellsight Spectacles (2,500 gp MIC) gives you a +5 competence bonus to use UMD.
20+CL is the target
Levels+3 due to keeping UMD pumped
Levels/2 (so at level 9 this is a +4 modifier)
Cha
Spellsight Spectacles give a +5 competence bonus
5 ranks in Spellcraft give a +2 synergy bonus
5 ranks in Decipher Script give a +2 synergy bonus
Levels+3 (class skill bonus)+4 (Razmiran Priest)+5 (Spellsight Spectacles)+2 (Synergy)+2 (Synergy)=Levels+16+Cha Modifier
But remember you also get the d20 roll and a roll of 1 on a skill check is not considered a failure, thus you area going to get Levels+17+Cha Modiifer
So as long as your charisma is 16 or higher starting at level 9 you auto succeed on the UMD check to use the scroll.
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Seriously this ability is WTF