Just make sure you have a haste enabler lying around
This unassuming 2-mana instant packs exactly the kind of flexibility any Green deck needs: it destroys an artifact, an enchantment, or exiles a card from a graveyard AND replaces itself with a card draw
If you run mostly artifacts, which is an easy task in Mono-Blue, youll get to effectively draw a lot of cards via the Future Sight effect, too
And since it has those symbols, it has the Five Color identity, which limits it in Commander, but it is very strong as a leader, and with every card to choose from that's been printed, this should dig pretty deeply into your options
Its an obvious pick, but Haze of Rage is a shoe-in for Firebending decks, as the buyback is much more reasonable
Doubling Cube $8 Doubling Cube requires the right casual deck to be good, but if youre planning to ramp pretty hard, this is a colorless Cabal Coffers a lot of the time