Set Cubes: Cubes that only pull from a collection of sets or cards that match the flavor of those sets ( Innistrad Cubes, Ravnica Cubes, etc.)
Remember, though, that issues of ego and self-confidence can sometimes cloud your thinking on this question (no matter who you are)
For just one ink, you're getting a 2/1 strength and willpower character who, once per turn, lets you discard a card to give it an additional lore point and Evasive until the end of your turn
This Blastoise, however, has the distinction of having a white card back, while the other three used Magic: The Gathering backs
C Common Nordic Relic Hlidskjalf X SPELL Special Summon 1 "Nordic" monster from your Deck, but you cannot Special Summon monsters from the Extra Deck, except "Aesir" monsters, while that monster is face-up on the field