Some of the cards are Kaiba's, which had to be done as Anubis only used about 5 or 6 cards (2 of which were not shown on-screen)
Now, if you have the cash to throw down on a hyper-expensive Base Set pack, you'll want a Charizard, Blastoise, or Venusaur pull to make that hefty sum of money worth it
Keeping them in a dry and cool place, away from direct sunlight and moisture, is important
Its the kind of equipment that thrives in any multicolor-heavy creature deck
Redoubled Stormsinger Redoubled Stormsinger often makes the tokens better because it adds haste
Both of those cards untap permanents in general which includes lands, creatures, enchantments, artifacts, and even planeswalkers, but many cards specialize in specific permanent types