So there's this feat from Monster Manual V that I don't think any creature except the text's three hobgoblin casters have ever taken.1 Here it is.
Battle Magic Tactics
Through intense training and impeccable timing, you and your allies learn to augment each other’s magical attacks when you focus your efforts on a single target.
Prerequisites: Spellcraft 6 ranks, arcane caster level 3rd.
Benefit: Each time you cast a spell that requires the target to make a saving throw, that target gains a Battle Magic Tactics token after the spell resolves. A creature gains a token whether the save succeeds or fails, but a creature that avoids a spell through spell resistance does not gain a token. Each Battle Magic Tactics token imposes a cumulative −1 penalty on saving throws against the spells of spellcasters that have this feat. At the end of each round, all Battle Magic Tactics tokens disappear. (84)
As a thought exercise, let's say the DM is an absurd literalist and reads the feat to mean that its benefit causes the affected creature, however briefly, to gain physical possession of an actual object.2
Here's the question: Is there a class or creature special ability, magic item, spell, or other effect or combination of effects that can somehow optimize or weaponize this token-granting ability? That is, if a physical token is actually gained by the affected creature, is there a way to harm, help, or hinder the affected creature based on the caster having given the creature this according-to-the-wacky-DM now-physical token?
1 My apologizes if I've underestimated this feat's rarity, and kudos to you if you've had a PC who took this feat and it was somehow effective. I can imagine a group of low-level casters (kobold sorcerers, perhaps) taking this feat and focus-firing their spells on a high-level foe so that their spells will be effective. That's a good use of the feat, I guess. But I think I'd still just give 'em all the feat Spell Focus.
2 Note that I know that the token the creature gains from the feat is supposed to be a metagame construct used solely for tracking the affected creature's saving throw penalty not, like, an actual, for-reals Chuck E. Cheese token that says −1 penalty on saving throws or whatever. You needn't convince me otherwise. So don't get hung up on that.