Ahh so something like this?
raw USERNOTICE:*:{
if (($msgtags(msg-id).key == subgift) && ($1 == #channel)) {
var %nick $iif($msgtags(display-name).key, $v1, $msgtags(login).key)
if ($0 == 1) {
msg $1 Thank you $msgtags(display-name).key for subscribing with a gifted sub from $2 <3
}
}
}