Fate Weaver can be acquired by soul summoning it with 100 soul gems.
This card has a low power/health ration for being an expensive card. However, it does have an upside. On the chance, after the card has been put into play, that the next card drawn, due to the "summon, draw a card," is a prophecy card, it has 0 cost, and can be played immediately. If this card is summoned after a rune lost, it can be played immediately for 0 cost, possibly giving the chance of 2 prophecy cards being played with 1 rune loss. Alternatively, this card may be put into the player's hand if they choose.