But it's an instant, and certain combo decks might require just that much redundancy
Creature Human Wizard When Spellseeker enters the battlefield, you may search your library for an instant or sorcery card with mana value 2 or less, reveal it, put it into your hand, then shuffle
If you do, put another target card from your graveyard on top of your library
Esper Sentinel Esper Sentinel is sometimes referred to as Rhystic Buddy as an homage to its similar effect to the infamous blue enchantment Rhystic Study, itself one of the strongest enchantments in Commander
Funnily enough, we both pulled off the combo in game 1 and 2, while in game 3 I had three draw steps to top-deck a red mana source to make it a 3 for 3
As for how this all relates to your commander, each colored mana symbol that appears on a card in your deck must also appear on your commander