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Mountain 5

Any sort of planeswalker support will work with your commander and all the other planeswalker cards

There are also cards that clone legendary creatures into non-legends, like Double Major or Nanogene Conversion

The option to steal their Sarkhan Vol, their Karn Liberated or even their Garruk Wildspeaker is pretty potent

A few cards in this set were especially difficult to pin down for this reason, and only through some excellent internet sleuthing did cards like Bloodfeather Phoenix find their home

And, as a compromise, Wizards of the Coast kind of cheated on the mana cost by more-or-less including it in the rules text