卫生纸的faq里说过practiced spellcaster是按照对玩家有利来判定的，原话如下：
The bonus from Practiced Spellcaster applies whenever it
would be most beneficial to the caster. A 4th-level cleric/4thlevel
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).
而natural bond的描述和practiced spellcaster非常接近：
所以，一个ranger 6/bm 1修了natural bond，应该可以认为其动物伙伴有效等级是10？
