The thing is, it's not like this combo is some undiscovered hidden interaction
This list will focus on the best fire-type cards in the game that can make any aggro deck work
These decks get a small attacking force out quickly, and then use blues premier interaction to protect those creatures or slow down opposing ground forces
As a group, decks using companions have too high of win rates and metagame share in Standard, Pioneer, and Modern, and have already necessitated bans in Legacy and Vintage
3 Liliana, Heretical Healer I know that a lot of fellow authors have been down on Liliana, but frankly, I think that shes the second-best of the pre-Planeswalker cycle of legendary creatures for a few reasons
As we noted when it was first spoiled, this is a bit of a revolutionary land