Mother of Runes was first printed smack dab in the middle of combo winter, with cards like Tolarian Academy, Tinker, and Memory Jar stealing a lot of the spotlight
This beautifully straightforward ability makes a creature harder to block, but not in an unfair or overpowered way due to the number of creatures and removal spells that can address a flying creature
In fact, if youre at infinite life and get with an opposing Infinity Elemental, youd still be at infinite life
And you're going to need some fuel with all of that battling, so you may want to bring something like a protein bar or apple or Sliver jerky, or whatever else you like to snack on
While its not guaranteed to deal with every creature, it will often leave behind a number of 4/4 Beasts, which will put you ahead against most opponents