Nyrine, fortune teller.

At the beginning of your upkeep, Scry 2.
Whenever Nyrine deals combat damage to a
player, look at the top card of that player's
library. You may put that card on the bottom
of her or his library.
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"If what I saw doesn't happen, nothing happens...
But if it happens and I didn't do anything to prevent
it... No, I could live with that guilt."