MTG Combo: Doubling Season + Estrid, the Masked + Oath of Teferi

Estrid's ultimate costs 7 loyalty tokens to put the top 7 cards of your library into your graveyard, then returns all enchantments to the battlefield, then all auras to the battlefield. Doubling Season doubles the counters put on a Planeswalker as it enters the battlefield. So instead of 3 loyalty counters, Estrid enters with 6, and one use of Estrid's first ability will bring you up to 8. Oath of Teferi allows a planeswalker to activate two abilities per turn. So upon Estrid being cast, she has 6 loyalty counters, then activates her first ability for +2 counters for a total of 8, then activates her ultimate at -7 to return all enchantments from the graveyard to the battlefield.