Loxi: This could be pretty neat as a flashback/"cast spells from your graveyard" commander, but I do agree that only once per turn makes this tricky if you don't have ways to copy the trigger, and at that point you're really jumping through some hoops
These bundles are the cheapest way to purchase March of the Machine Boosters, the Mastery Pass, or Limited play tokens
By now, Wizards of the Coast has printed over 15,000 cards of all different kinds, and some of these cards are so rare, valuable or unique that they can command serious price tags
If the game goes long enough, and people ramp hard enough, it could be much more than that
Krark, the Thumbless is a good option, allowing you to get extra Oozes from Slime Against Humanity, while giving you access to red and all the haste enablers you could want
All in all, I personally love the feeling of staring down an opponent with a bunch of open blue mana, so I'm always happy to see any one of them