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(Translation) Tomisawa (2000), p

The games also unique in that each deck will have a commander-style champion card, with its own life total and abilities

It has a bit more relevance in Commander

Crystal-clear defense against dust & UV for Pokmon, Lorcana, One Piece, and more

(Choose any number of permanents and/or players, then give each another counter of each kind already there.) Legendary Creature - Human Fungus Pirate Commander (CTRL to add secondary) Counters Experiment One Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.) Remove two +1/+1 counters from this creature: Regenerate it

That you have no personal ability to trigger Shapers Sanctuary means its fairly locked into sideboard only space (metagames could arise that might persuade us to gamble on the card maindeck, but its unlikely)