It is a trap card that lets you look at your opponent's hand and send one monster back to their deck
C Common Bite Shoes X DARK Level 2 [ FiendFlipEffect ] ATK 500 DEF 300 FLIP: Change the Attack or Defense Position of 1 face-up monster on the field
The Valkyrie is played mainly in angel decks, but it can be played in cleric decks and decks that value lifegain
This list will go by a combination of the most expensive card in the set and the cost per booster pack in order to reach a rough value for the most expensive sets
UR Ultra Rare Splendid Rose X WIND Level 6 [ PlantSynchroEffect ] ATK 2200 DEF 2000 1 Tuner + 1+ non-Tuner monsters Once per turn: You can banish 1 Plant monster from your GY, then target 1 face-up monster your opponent controls
If you're not after promos or coins and are looking more for EXs, if you have a large budget, you could get one of the Red and Blue Collection Boxes and guarantee yourself an EX, or if you have a slightly smaller budget, booster packs may be the way to go