We all know by now how good creature tutors are in Magic, and Speaker provides a very exciting new option in that category
(They put the top two cards of their library into their graveyard.) If a player is instructed to mill more cards than they have in their library, they put all of the cards in their library into their graveyard
Well, its only a matter of time until we get an elephant precon
The Problem of Diminishing Returns In the past two years though, WOTC doubled the amount of catch-up land cards from 7 to 14
Having these counters go onto your lands instead of on a creature or some sort of special mine token, certainly offers your stockpile far more protection from different responses your opponents may otherwise have
In Modern, apart from spawning a new type of deck, the most likely home seems to be some sort of combo deck where Glorious End can buy one extra turn to set up the combo and win the game