You can set up the general context of the call ("I'm in a Magic game and I need someone outside the game to make a choice"), but you shouldn't explain anything that's going on in the game or what the consequences of their choice may be
But back then, the top decks of the day hadn't considered this logic
Admittedly, Phylath pushing you toward basic lands during deck construction is a bit annoying, but the massive number of creatures it makes and the ability to hand out 4 power to a Plant creature of your choice is incredibly strong, and turns late game mana ramp into a lot of potential pain for your opponents
Recent sets like Lorwyn Eclipsed cards have added even more tribal support to the pool
While this feeling is true on its face we haven't seen $700 Standard decks in quite a while perhaps looking at the history of Standard deck prices can lend context to the current prices and why they feel so extreme
Olivia, Crimson Bride Olivia, Crimson Bride works perfectly fine without other legends, but it incentivizes you to play a few extras