For example, Arid Mesa allows you to search for any Mountain or Plains card, not just a basic Mountain or basic Plains
Historic spells can only trigger a card that cares about historic spells once regardless of how many types it has that make it historic
Introduced in the first Commander precons back in 2011, its been a mainstay in the format since its release
Arguably the best card draw effect that white has access to, Esper Sentinel does have the limitation of its white color identity and thus lacks the flexibility of colorless artifacts that fit into any deck but as long as your commander doesn't hate Plains, you can't go wrong with this studious Sentinel
3 Teval, Arbiter Of Virtue Dive A Little Deeper Delve has been one of those very strong abilities that is just a little too good under the right circumstances
This deck also runs a full playset of Glorybringer and a couple of copies of Demanding Dragon