That's nasty, because there is always someone frumping around with a bunch of key permanents to take out, like Primeval Titan, Deadeye Navigator, Elspeth, Sun's Champion, Karn Liberated, the aforementioned Mind's Eye or Sylvan Library, all of their non-lands
Do I give my opponent additional cards, or do I wait an additional turn to be able to pay one more
Blade of Selves The very first card to introduce the excellent myriad mechanic to Commander and to this day arguably the best myriad card in the game, Blade of Selves enables tons of silly shenanigans
So discarding or milling Lhurgoyf creatures gives you a free one, which might be a bit niche, especially since there aren't many creatures in this unique kindred type, but has potential to make big plays
Note it's legendary so you can only make one Octopus, attack and then make one untapped to replace it