Apex domains cannot have CNAME records.
Question and response
Question
dig cardgamesdownload.com. NS
Answer
cardgamesdownload.com. 1 NS ns-552.awsdns-05.net.
cardgamesdownload.com. 1 NS ns-1726.awsdns-23.co.uk.
cardgamesdownload.com. 1 NS ns-1857.awsdns-40.co.uk.
cardgamesdownload.com. 1 NS ns-413.awsdns-51.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0