Essentially, the only way to get more of these myth tokens are currently from your husband's pet he has. As long as he keeps getting it to mega (or ultra for more tokens I believe) you can have a chance for it to drop. Looking up your pet online and going to the website, "wiki.wizard" gives almost everything about pets and nearly the entire game. Pretty much a Wizard101 guide for even me, I'm a veteran with every school maxed out.