Protection from a color means that the target creature can't be blocked by creatures of that color, can't be the target of spells of that color or abilities from sources of that color, can't be enchanted or equipped by Auras or Equipment of that color, and all damage that sources of that color would deal to it is prevented
But that's the problem
No player may take any actions between the time you choose the card and the time you return it
With Modern Horizons 2 and, more specifically, Garth One-Eye, the community has found that we can still play with some of their effects, even if its not in their original form
Altar of the Brood was already a strong card, but with Bruvac the power level gets revitalized to the point where a turn one Altar could very well mean that you are going to mill upwards of thirty cards from each of your opponents deck on its own
Embrace the odds and remember that dealing with demons is not for the faint-hearted!
