Help me understand if this trade is fair

So I honestly don't know what the value is of 'regular' legendaries versus fusions. Anyone got some pointers as to how cards of different rarities relate?

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Yes because trading for fusion ingredients can be a long waste of time. The cards he is requesting you have plenty of and they're not limited.

It's fine. Fusions are worth between 1 and 4 regular legendaries, depending on the ingredients. I personally would only charge 2 for Falco - the ingredients are 1x legendary and 4x rares, but that means remembering what the ingredients are for each