Afterlife Insurance Debtors' Transport Gate to the Afterlife Imperious Oligarch Indebted Spirit Knight of Sorrows Knight of the Last Breath Ministrant of Obligation Orzhov Enforcer Orzhov Racketeers Seraph of the Scales Syndicate Messenger Tithe Taker
You can sacrifice them, get a token from Titania, and get them back without too much issue
I'm surprised Wizards included Darksteel Mutation and Imprisoned in the Moon, which are some of the nastiest removal spells you can use against commanders, something I didn't expect they'd want in their introductory products
If you can get to 6 mana reliably, the artifact takes your board presence to another level and helps to finish off games with plenty of card draw to boost this presence
Otherwise, buying cards standalone is perfectly legit as well, especially for some of the less pricey picks from the latest Universes Beyond set
The kids these days just dont give Mana Drain the credit it deserves