Card draw is always good and being able to target those draws to cards that you want and/or need is even better
Find a way to give her double-strike, and you'll be doubling that damage twice
If you want to talk numbers, Id say 8-10 pieces of mana ramp is a good number to aim for, but thats very arbitrary
Rather, think of these statistics as a compass to guide your early picks/archetype positioning
Number 0 Language English Legal Formats Competitive Brawl Restricted Formats Timeless, Vintage Not Legal Formats Alchemy, Modern, Pauper, Pioneer, Standard Banned Formats Brawl, Commander, Historic, Legacy Rulings (11/17/2017) Once your life total is 0, you can't pay any more life, even if you've somehow not lost the game yet.