Full Arts and Illustration Rares are now classified as secret rares (like the Japanese sets), which is why there are far more secret rares
Pokemon of Ancient Times : Omanyte, Omaster, Kabuto, Kabutops, Aerodactyl (any of each)
One of the first decisions everyone makes is which D&D class their character will be
Along the same lines, your opening hand should form around the cards that work together, rather than a linear curve
Younger players may not realize, but before the game introduced the keyword Defender, the creature type wall had the additional rule that they couldnt attack.
Since each commander is a legendary creature , most of these cards already have inherent synergy in your deck