Function in array as arguments for WP_Query

I suspect the problem is coming from $MyCustomField which you enter as such in: 

'terms' => array( $MyCustomField ),

The query consider it as only one value: '64,72', a string.

So try:

$MyCustomFieldValues = array_map( 'intval', explode( ',', $MyCustomField ) );

This will also ensure your values are integers.

Then: 

'terms' => $MyCustomFieldValues,

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