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And when she dies, she passes that strength on, putting X +1/+1 counters on each legendary creature you control, where X is the number of counters she had

On TCGPlayer, the current market value for the card is $32.56

In this case, room #1 will have both doors unlocked and the abilities from room #2

Murderous Rider is just that plus the option to maybe have a creature later on

There are some cards that are guaranteed to have a massive impact on the format and have already been talked about at length (Counterspell, Abundant Harvest, etc)

There are Copy Tribal decks in Commander where you copy your Commander with things that allow you to have more than one legendary like Mirror Gallery