[RPG] How to get Sorcerer Bloodline Arcana

As with most Sorcerers, your spell selection is going to have a far greater effect on your character's playstyle than feats ever will. Once your Luck feat requirements have been satisfied, consider filling the rest up with general, Sorcerer-useful feats, like Versatile Spellcaster (as Swooper suggested), Arcane Thesis (Player's Handbook 2) coupled with Metamagic feats, reserve feats (Complete Mage) and so on.

Unluck (Spell Compendium) and Alter Fortune (Player's Handbook 2) come to mind as luck-themed spells.

As for luck feats:

• Lucky Start is definitely the first Luck feat I'd take. Initiative is one of the few rolls that consistently matters for a Sorcerer.
• Magical Fortune is OK, I guess.
• Tempting Fate is kind of planning to fail, but it's likely to save your butt sometime. So sure, why not.
• Lucky Catch is far too situational to be worth it.
• I'd consider Unbelievable Luck or Survivor's Luck next.

Domain Access: Luck is a complete trap. Notice how many spells known it costs you. You're losing one spell per (presumably spell) level, and only get the meager benefit of being able to cast one domain spell per spell level per day in return as far as spells are concerned.

Regarding your question about Draconic Heritage: If you're talking about the feat presented in Races of the Dragon and Complete Arcane, it doesn't add any spells known to your list. It's the Draconic Legacy feat that adds them.

It applies to any spell that does energy damage, which is any spell that does Acid, Cold, Electricity, Fire, or Sonic damage. Energy damage is a misnomer, as it refers specifically to elemental damage. It does not include Force, Negative Energy, Positive Energy, or any other damage type. Only damage types that can be reduced by Resist Energy are considered to be energy damage.

James Jacobs backs this up, as does this glossary entry.

For example, you could apply your bloodline ability to a Cone of Cold to make it deal Fire damage instead of Cold damage, but you could not apply it to Magic Missile or Inflict ____ Wounds.