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
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
In a format that has seen turn 2 wins, resilient locks, and ultra-powerful attacks, this is what the best decks tend to look like: a bunch of solid cards together, with some disruption to slow down the opponent, even if it doesnt prevent them from playing
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