Apex domains cannot have CNAME records.
Question and response
Question
dig mtgsy.com. NS
Answer
mtgsy.com. 5 NS dns4.mtgsy.com.
mtgsy.com. 5 NS dns0.mtgsy.com.
mtgsy.com. 5 NS dns2.name-s.net.
mtgsy.com. 5 NS dns3.mtgsy.com.
mtgsy.com. 5 NS a.ns.mtgsy.com.
Authority
The response has no authority records.
Additional
a.ns.mtgsy.com. 5 A 199.73.83.1
dns0.mtgsy.com. 5 A 45.79.43.217
dns2.name-s.net. 5 A 74.207.254.12
dns3.mtgsy.com. 5 A 66.228.62.33
dns4.mtgsy.com. 5 A 178.79.133.227
a.ns.mtgsy.com. 5 AAAA 2620:1f:8000:0:0:0:0:1
dns0.mtgsy.com. 5 AAAA 2600:3c00:0:0:f03c:92ff:febb:133c
dns2.name-s.net. 5 AAAA 2600:3c01:0:0:f03c:92ff:fe24:8ad0
dns3.mtgsy.com. 5 AAAA 2600:3c02:0:0:f03c:92ff:fee5:6b61
dns4.mtgsy.com. 5 AAAA 2a01:7e00:0:0:f03c:92ff:fee5:1daf
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0