It's useful as a fast sanity check but shouldn't be your primary pricing tool
Team Rocket's Mewtwo ex Commands an Army of Powerful Pokemon
With three mana, you can play plenty of great commanders, cast tons of mana rocks, and have access to all sorts of other ramp spells
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Its best party trick, however, is building up an army before using Akki Battle Squad to trigger a surprise combat phase, while building up modified creatures will let you drop Walking Skyscraper for nothing if you time it right
Specifically, Nahiri's mana value is always 4