mtg is legendary a card type TR&CI 38: The Legend Rule & State-Based Actions 10 Card Types for Commander

7: Destroy all non-Dragon creatures

So not only will you be increasing the amount of Ink available to you when you use your Inkwell, but Gramma Tala also helps you accelerate your way to victory too

You can either run enough ramp to just kill her, or Voltron first like Rancor and then two or three to put her over the top - either works for me

There are tons of ways to do this, whether you want to go the combo route, focus on Construct tokens, generate a lot of tokens in general, some combination of the three, or a different direction entirely

The prevalence of treasure, especially in Black-Red, will make this better than it looks