A card with no mana cost has a mana value of 0
Just for the added Mana acceleration) If protection pieces are your next target, consider adding in Flawless Maneouver, Coppercoat Vanguard, Lena, Selfless Champion or Boromir
For other uses, see The Brothers' War (disambiguation)
Then there are some that are better than averageperhaps including one or more Double Rare (RR) or Art Rare (AR) cards
Incidentally, Wizards of the Coast used the same treatment on the land cards in the mostly non-legal Unfinity set to fit its overt space theming
A ton has changed in the Lorcana metagame since the last time I updated this guide, including several new sets, an entire rotation, new mechanics, and a brand new set that should be absolutely huge for Lorcana