It doesnt come up that often, but it does come up more often than using Arcane Denial on your own spellusing two cards to get three cards is trading a resource (cards) for the same resource (cards), which makes it not that exciting, while trading between resourcesfrom cards to mana, is more likely to get you something you need
Two examples of build-around lands from Legacy are Dark Depths and Cloudpost
If you like to be public enemy #1, Amarant Coral is the commander for you
If you want to support a creature-based strategy while still casting your Opt and Preordain, put this Simic card in your command zone
If a legendary permanent or an artifact entering or leaving the battlefield causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time
any lands deck and lots of other decks use Crucible to recycle lands like no one's business