collector booster box foundations Beginner Collector Boosters are known as the shortcut to the coolest cards in the set Magic: The Gathering Foundations -

Sillva, Warlord of Dark World - 2600/1700 "Since Sillva was discarded by your card effect, his secondary effect activates: you return two cards from your hand to the bottom of your deck

[+1]: Until your next turn, up to one target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value

Good examples would be Salamangreat Violet Chimera, which gets a powerful ability if you use a different Salamangreat Violet Chimera as material, or Dual Avatar - Manifested A-Un, which gets a range of different powerful effects for summoning with different Fusion monsters

Of the 900 German first edition Gluraks that PSA has graded at the time of this writing, 50 have received the lofty PSA 10 distinction

Ad Nauseam There's no getting away from it, the next several spots on this list are reserved for the chase Mystical Archive cards, which are already, provably, valuable