Yes, the legendary rule states that you cant have two legendary permanents with the same name under your control
Thankfully, this new endeavor is a novel innovation that pays off, thanks in part to a relatively low price point and perfect clarity as to what comes inside the box
Marwyn, the Nurturer While the top of this list would certainly feature the likes of Rofellos, Llanowar Emissary from Urzas Destiny , that card is actually banned in Commander due to the fact that it simply doubles up the mana you get from Forests an objectively overpowered effect
Fable of the Mirror-Breaker / Reflection of Kiki-Jiki Fable of the Mirror-Breaker is one of the best sagas in MTG, probably only out-valued by Urza's Saga
Not really thinking about the fact that it isn't - how do I say this - primarily a Haunting Echoes
In addition to coming in untapped the turn you play it, [c]Sunhome, Fortress of the Legion[/c] can give any creature double strike for a turn at the cost of four mana