A note about Regenerate in MTG Regenerate is a retired ability that works like a shield to protect your creature from being destroyed on that turn
What are proxies used for
One of the reasons that we see Burn as an archetype in Modern, specifically, is because there are actually enough cards that you can put directly into attacking an opponents life total now that you can create enough of those moments I was talking about earlier to have that be a consistent gameplan
Kaheera cant be both your commander and your companion, so dont even think about it
That's White's version of Heroic Intervention, and it'll blow out board wipes, target removal, and combat tricks all the same
For sacrifice fodder , you have a variety of token generators like Selesnya Evangel and Selesnya Guildmage as well as creatures that like to die including Yavimaya Elder and Symbiotic Wurm