The additional beginning phase all happens during the current turn
If your main goal is to make Legacy more affordable and accessible, however, there are other, better, easier ways to do it that dont involve fighting against WotCs seemingly unbreakable oath
Draw Draw a card from the top of your deck
Now that cards are finally flowing into players hands in quantities large enough to turn away speculators, the fun can really begin
Eritettes colors give you plenty of Aura options to choose and control the field, and her lifegain will keep you in the game long after her end-of-turn effect has drained your opponents of vitality
For example, if you control both Zell Dincht and Exploration (an enchantment with "You may play an additional land on each of your turns"), you'll be able to play three lands during each of your turns.