Clive's Hideaway's last ability only cares if you control four or more legendary creatures at the time it resolves
To represent the token, you have three choices: (1) Use the printed token included in some Unfinity booster packs, (2) use another printed Magic card or token as a substitute, or (3) use anything else, read the next ruling, and be slightly sad
In fact, the Zendikar Expeditions, Kaladesh Inventions, and Amonkhet Invocations all came before, in what was called the Masterpieces series (Ixalan, too, was to have these called Explorations, but this line was canceled before production)
Soul of Windgrace does everything my deck wants to do: discard lands
1 The Shire
Having two different types of boosters was causing strain, and, well, stores were opting to buy Set Boosters