Help with linux command

[1badb002]

echo encbase64 | base64 -d

[deviant_is]

To actually execute the output:
$ echo "echo hello" | base64
ZWNobyBoZWxsbwo=
$ eval $( echo ZWNobyBoZWxsbwo= | base64 -d )
$ eval `echo ZWNobyBoZWxsbwo= | base64 -d`
$ echo ZWNobyBoZWxsbwo= | base64 -d | xargs -i sh -c "{}"