Sharing the deck I used to climb from D5 to legend on 19 May 2021. Upvote for detailed guide.
The main strategy is to ramp quickly to 8 drops. In the process you can corrupt Strongman for tempo taunt body. Nature Studies on 1 into Wild Growth on 2 is ideal. Overgrowth on 4 into Lightning Bloom on 5 allows 8 cost drops.
[Primary] Nature Studies, Wild Growth, Overgrowth (this is core)
[Secondary] Lightning Bloom, Innervate (this is good keep)
[Tertiary] Guardian Animals (keep only if you have any of the above)