Can Sprite Call be used as a Reaction when it would be sent to Trash due to losing control of a Battlefield?

Ruling: Sprite Call cannot be used as a Reaction in this situation. The card goes to Trash as a result of cleanup, which doesn't use the chain, so you cannot react to it.

Nuances:

• You need to trigger Sprite Call before your other unit gets removed
• You can't conquer a Battlefield that you already scored that turn (including scoring for holding)
• You can lose and gain control of a Battlefield, but that doesn't result in a conquer