Green decks arent always the most combat-oriented, but its not difficult to imagine a base of Lotus Cobra, Eternal Witness, fetchlands, and Wasteland as a starting point to make Spring-Leaf Avenger work
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Im not sure where Skysovereign, Consul Flagship will fit in Standard, and its facing heavy competition at the five-drop slot from other mythics in the format, but the card is powerful and the (literal) Flagship of the set, so Im not counting it out
The Energy cards in Esper should help it weather the early assault, too
She comes down early, gives you mana, and helps to get those Angels even bigger so that you can eliminate opponents much faster
This guide will cover several decks that you want to start building right now to be able to have the upper hand on your opponents and where you can find the rarer cards from the booster packs