If you bounce a creature, but your opponent has nothing else to do with his or her mana the following turn other than recast it, then you've only enjoyed a tempo advantage for a brief snapshot in time
On an Unknown card, theres basically one route to joy, and thats to make them laugh
Even the base printings of Gemstone Caverns are worth around $50, so no matter what, you'll be happy to open a copy, and very, very happy if you happen to open Gemstone Caverns #51.
Goat is even worse, requiring three energy to perform an unimpressive attack, keeping it out of competitive viability in decks that utilized Grass energy
The most valuable cards from the McDonald's Collection 2016 set typically include holographic rare cards, first edition prints, and cards featuring popular Pokemon
Estimated value: $400 - $3,500 (depending on condition) Advertisement Time Vault can grant an extra turn