Tree Vermin OTK
This is based on an old deck from ESofDawn in an Aquablad video (https://www.youtube.com/watch?v=kniajlAOmJQ&t=70s). Its trickier to pull off now due to the Earthcraft nerf. Fun when it works though.
The OTK is using Tree and Engineer to buff Vermin 3 times.
Mulligan for Vine Wall, Wild Growth, Earthcraft (if 2nd), Wisdom.
Step 1 - Landblock
Build lands to cover all the summoning spots which are within hitting distance of your orb. Start with the diamond in front of you orb. This is to delay aggression after you Doomsday.
Step 2 - Get 5 Forests and 2 Deserts
You want 5 Forests to play Kodama. You have Wild Growth and Vine Wall to help you get there so it is often better to draw for those. The two Deserts you need to build, firstly for Doomsday and later for Vermin. Once you play a Kodama you get to 10 lands for Tree.
Note: Feeding Kodama is cost neutral and is often better than leaving it on the field as you may lose it.
Step 3 - Doomsday
Only Doomsday if it hurts the opponent - if they have low cards or Faeria then do it. Other times it won't be necessary.
Before Doomsday use any excess Faeria to draw with Wisdom and play out Wild Growths to thin the deck.
You need to be setup for the Doomsday recovery first. You want to play Tree the turn after. You can do this with 2 of Pact/Shrine. Even better is to have Tree and Engineer and 3 of Pact/Shrine which allows you to +1 and proc instantly.
Step 4 - Protect the Tree
Tree is public enemy number one and the opponent will be gunning for it. Place it as safe as possible, surround it with stuff, use Engineers for those procs.
Achieve this and you win.