Brain Spider (L7 Domain spell; XPH & SRD) - not bad for an intrigue game.
Choose Destiny (L9 Domain spell; Races of Destiny) - get 5e-style Advantage on basically all rolls for 1 round/level. Begging so hard for Persist abuse.
Commune With Nature (L4 Ranger spell; SRD) - it's level 5 for the Druid so you get to cast this spell first, and rub it in that dirty hippy's face for up to two character levels.
I Smell Your Fear (L4 Ranger; Ghostwalk) - it's
locate creature except 1 hour/level instead of 10 min/level, and the spell's name is 4,000% more awesome.
Listening Lorecall (L2 Druid; SpComp) - Unseen Seer gets skill points, Blindsense is a fine use for them.
Lay of the Land (L1 Ranger; SpComp) -
Summons your mother- it's a mini
find the path but only costs a 1st level spell slot. If you find
the path interesting, this should be high on your list.
Lore of the Gods (L2 Cleric; CChamp) - +5 on all Knowledge checks unless your god has the Knowledge domain, in which case you get +10 instead. Hello Knowledge Devotion.
Grave Strike (L1 Cleric; CAdv) - sneak attack the undead for 1 round; you're an Unseen Seer so you should have some kind of Sneak Attack dice available, but you are mostly a Wizard so maybe you have better things to do with your actions.