The "Legend rule" - Under the original "legend rule", if a legend or legendary land was on the battlefield, no player could cast the same legend or play the same land, respectively
The most recent sale before that was less than half of that price at $2,247
king-saproling on Pokemon EDH - 111% altered art 5 years ago 5/3/2021 Update - completed Mischievous Quanar (Mimikyu) and Master of the Veil (Substitute Doll)
Instead, if Rally the Ancestors or Collected Company decks do end up being too good, I expect those namesake cards to get hit due to the risks created by cards like these in non-rotating formats where every new creature printed has the risk of making those cards broken all over again
And with the cards later on in this list, getting 3 copies into your hand in one turn isnt an impossible task
(!) [4] That is why the phrase is often used