The value of the Japanese playing cards was illustrated recently when one described as the "holy grail" sold for 30,000
To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases (such as that of Reidane, God of the Worthy), then apply any cost reductions
We also have an entire ranking dedicated to card draw payoffs if you're interested in more depth on the subject
Schematic serialized foil serial number: around $300 Well of Lost Dreams First printed in Darksteel , the Artifact synergizes with Lifegain decks while providing card draw
Keep an eye out for the little Clefairy doll tucked into the scene too, making this a fun cameo card on top of a great illustration
On entering the battlefield, this black legendary enchantment gives all creatures -X/-X, where X equals the amount of extra mana paid into the enchantment