Republication of one old image but this time in version safe  
https://derpibooru.org/1929973?q=editor%3Aproto29
 
It is just that I am a fan of the couple sparity and that so that he rarity face is spike shall have to both mix their nature, for …  
8I you to voyer that I want to say I not you am going to draw a picture …  
_ well there made it is already made.  

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Let us return has what I said and thus rarity and spike shall have a similar life expectancy and can live together for a very long time and thus this appearance represents well the rarity of intended (one supports not insignificant for twilight in 1000 years because the princesses live for a very long time in world
 
source:  
https://derpibooru.org/1345430?q=nightmare+rarity