You can determine the value of your graded Pokmon cards by checking recent sold listings on platforms like eBay and TCGPlayer for the exact card, grade, and grading company
Final Fantasy 8's Sorceresses Before one can understand who Ultimecia is, one must understand what she is
Add 1 Level 4 or higher "Vampire" Monster from your Deck to your hand, and if you do, send 1 Level 2 or lower "Vampire" Monster from your Deck to the GY
All these cards in a single set is just asking for some sort of UW flyers aggro deck, probably with Dovin, Grand Arbiter and Favorable Winds and about 20 1-drops
Soulbond and horsemanship
Bouncing back to your hand isn't as bad as sacrificing a creature, but the effect still sets you back in a big way and can be followed up with a nasty counterspell