This isn't a one-off piece of lore that has been retconned either - Ruby, Diamond and Pearl, Heartgold and Soulsilver, Black and White, Black and White 2, X and Y, and Alpha Ruby and Omega Sapphire's Pokedex entries for the poor thing all make reference to this
If you never see lands (or draw nothing but lands) in your opening hands, its a sign your land count is too low (or high)
In grindy Commander pods, it turns your mana base into a resource you can reuse over and over
C Common Warning Point X TRAP When a monster(s) is Summoned: This turn, that face-up monster(s) cannot attack, its effects are negated, also it cannot be used as material for a Fusion, Synchro, Xyz, or Link Summon