Rainbow's Card from Janet

Janet's was so thoughtful to enclose the conversation she had with her grandson about this envelope.

Transcribed, in case you read the blog on your phone:

A conversation with my artsy, 9 year old grandson who often critiques my envelope art:
Kid: Why didn't you make a rainbow if her name is Rainbow?
Me: I wanted to use the energy stamps. And I thought everyone else would make a rainbow. And I don't have any rainbow stamps.
Kid: Then why don't you give her a Rainbow Energy Card?
Me: What is and Energy Rainbow Card and where do I get one?
Kid: I have some. They are Pokemon cards.
Me: Sounds like a good idea. Can I buy one from you?
Kid: I'll sell you one for $2.
Me: Amazon says 78-cents.
Kid: OK $1.50.
Me: I'll give you $1. Final offer.