Neheb, Dreadhorde Champion can help you generate potentially tons of mana
Feed the Swarm is maybe not better than Deadly Rollick, but it is more flexible
Keep in mind that the prices of some of these cards are bound to change as the decks are released and cards start to circulate and get played, so this is just an estimation
If a card specifically states that it moves Commanders from the battlefield to the Command Zone, anything that's been mutated onto your Commander moves along with it, then falls off - and will probably be stuck there, since there's no way to cast non-commander creatures from the Command Zone
The four Commander decks have been reprinted twice, so the supply of them is not as restricted as it initially appeared, but you'll still struggle to find them in shops now
Introduction to Commander Commander is one of the most beloved ways to play Magic: The Gathering, offering a unique blend of strategy, creativity, and social interaction