Traditionally, you really dont want colorless lands in a deck thats trying to get WUBRG, but given that this only needs colorless mana to cast and the activated ability can use colorless, its not really a problem
Deny someone their Sunforgers search and cast while still unattaching the equipment, stop that Senseis Divining Top from going to the top of their library, or allow an opponent to sink 50 health into their Aetherflux Reservoir only for you to counter the ability and stop them from dealing 50 damage to you
Both are fantastic card advantage items, simultaneously destroying hands while maintaining, or in some cases rebuilding yours
Overall, Journey Together is an incredible set, and the low entry point is what makes it rank so highly on this list
There are lots of different sleeve brands out there, most of which vary their sizes slightly on one axis or another