You can take your pick from there, but the core of those three plus Krasis and Nissa, Who Shakes the World is incredibly tough to beat
Apart from the issue of some cards not having playable substitutes, the other reason I tend to dislike this advice is that part of what makes formats like Commander fun is the diversity that they offer, and this diversity is built, in part, on players being able to access and play with weird, old, nostalgic cards that don't really see play in other formats
Just think about the scheduling

There are four boxes, and they are as follows: MTG x Final Fantasy - Garland at the Chaos Shrine Garland, Royal Kidnapper (Blue/Black) The Destined Warrior (White/Blue/Black) The Destined White Mage (White) Chaos Shrine's Black Crystal (Black) The Destined Thief (Blue) The Destined Black Mage (Black) MTG x Final Fantasy 8 - Children of Fate Edea, Possessed Sorcerer (Blue/Black/Red) Fated Clash (White) Rinoa, Angel Wing (White) Seifer, Balamb Rival (Black/Red) Duelist's Flame (Red) Squall, Gunblade Duelist (Red/White/Black) MTG x Final Fantasy 9 - The Siege of Alexandria Brilliant Wings (White) Judgment of Alexander (White) Mega Flare (Red) Amarant Coral (Red/Green) Vivi's Persistence (Red) Search for Dagger (White) MTG x Final Fantasy 15 - Camp Comrades Noctis, Heir Apparent (White/Blue/Black) Fishing Gear (Colorless) Chocobo Camp (Green) Flash Photography (Blue) Campsite Cuisine (Green) Warrior's Resolve (White) Not every box allows players to use each card it comes with in the same MTG Commander deck, as one of the format's core rules is to use cards within the commander's color identity

This isnt an abnormal pattern
It carries its own code (EB-01 vs OP-06), and also contains fewer cards overall as compared to the main line releases (62 vs 126 card types)