MODERN HORIZONS 3: RED Ashling, Flame Dancer is a nice throwback to OG Ashling
Math and personal experience indicate to me that you'll want to start with 10-15 ramp cards and tweak from there
A great inclusion for any mono-colored deck with a lot of basic lands is Extraplanar Lens
Put one into play face down as a 2/2 creature, and the other into your graveyard
Auora, Dreaming Guardian and Hercules, True Hero will help protect your high-lore characters and further control the board by making favorable trades, while Develop Your Brain and Beast's Mirror will help ensure that you can continue drawing more cards and consistently find your big characters
Five or so years after I started working in Magic R&D, I had managed to not only get onto the Dominaria Vision Design team, but also the Dominaria world guide writing team