Answer:
My first is a creature whose breeding is unclear. My second, a price you must pay. My whole can be found in the river of Time and refers to events of today.
Whoever makes it, tells it not. Whoever takes it, knows it not. Whoever knows it, wants it not. What is it?
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around.
Bright as diamonds, Loud as thunder, Never still, A thing of wonder.
What turns from red to black as soon as it touches water?
As round as an apple. As deep as a cup. All the king's horses can't pull it up.