应该是2吧
FAQ里说:
Does the bonus to caster level from the Practiced
Spellcaster feat (from CAr and CD) apply before or after
other caster level bonuses (such as those from the Good or
Healing domains)?
The bonus from Practiced Spellcaster applies whenever it
would be most beneficial to the caster. A 4th-level cleric/4th-
level fighter with the Healing domain and Practiced Spellcaster
would cast Conjuration (Healing) spells as a 9th-level caster
(base caster level 4th, +4 from Practiced Spellcaster, +1 from
the Healing domain). A 4th-level cleric/4th-level rogue with
Practiced Spellcaster who activates a bead of karma (from a
strand of prayer beads) would cast her spells as a 12th-level
caster (base 4, +4 from Practiced Spellcaster, +4 from bead of
karma).
不过practiced spellcaster和wild mage并存的时候是先算+1d6