Bant

If all divinity counters on a creature are moved to a different creature, the indestructible ability doesn't move along with them. The first creature no longer has indestructible because it no longer has a divinity counter on it. The second creature doesn't have indestructible because the chaos ability didn't target it.

A creature with a divinity counter put on it due to the chaos ability retains indestructible even after Bant stops being the face-up plane card.

If you attack with multiple creatures, but then all but one are removed from combat, your exalted abilities won't trigger.

Some effects put creatures onto the battlefield attacking. Since those creatures were never declared as attackers, they're ignored by exalted abilities. They won't cause exalted abilities to trigger. If any exalted abilities have already triggered (because exactly one creature was declared as an attacker), those abilities will resolve as normal even though there may now be multiple attackers.

If you declare exactly one creature as an attacker, each exalted ability on each permanent you control (including, perhaps, the attacking creature itself) will trigger. Note that if a creature has multiple instances of exalted, each one triggers separately. The bonuses are given to the attacking creature, not to the permanent with exalted. Ultimately, the attacking creature will wind up with +1/+1 for each of your exalted abilities.

A face-up plane card that's turned face down becomes a new object with no relation to its previous existence. In particular, it loses all counters it may have had.