white protection cards mtg Top Mono-White How does Circle of Protection:

You choose all of your modes at once

Opponents will know choices made by earlier opponents when making their choices, although a card chosen to be discarded this way isn't revealed until it's discarded

Now, the vast majority of Doctor Who MTG cards are worth under $5

Additionally, being a green creature means you can find it off Summoners Pact and Green Suns Zenith, and its very important for those cards to give you access to this effect

"Legends with radical shift" is likely referring to the idea of having two copies of the same legend in the set, but with different subtitles and depicted in two different realities