I was fooling around with my Rainbow Neos against the AI.

After normal summoning Crystal Vanguard and fusion summoning Rainbow Neos using Elemental Hero Neos, Polymerization and Rainbow Dragon, I decided to use Rainbow Neo's first effect. The effect asks you to send one monster you control do the Graveyard, and shuffle all of your oponent's monsters into the deck. However, I could only select Rainbow Neos itselft as a sacrifice, and not Crystal Vanguard.

So my question is if this is somehow an intended behaviour that I don't understand or a bug. 
Crystal vanguard is a pendulum monster, meaning it can't be sent to the graveyard to pay rainbow neos' cost.
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