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With only 3 Gardening in the current build and none of the Aroma Field Spell, you dont have that guarantee

The only way around this kind of thing is a clone like Spark Double, which can copy legendary creatures without issue because it removes the legendary typing when it copies something, or another way around the legend rule like Mirror Gallery or Sakashima of a Thousand Faces

Or my Faldorn, Dread Wolf Herald deck

As for me, I get to travel around quite a bit in March

Although there are situation where a 6 loyalty walker is just dead and your pair of rats would live the Nahiri is a much better deal and a much more powerful package