Cut Down Cut Down kills pretty much everything you can spend 3 or less mana on
Here, Sisay, Weatherlight Captain, is the right choice
Both commanders actually care about lands and help push the theme forward, unlike Lord Windgraces backup options, Gyrus, Waker of CorpsesGyrus, Waker of Corpses or Thantis, the WarweaverThantis, the Warweaver
Commanders like Sythis, Harvest's Hand, Uril, the Miststalker, and Eriette, the Beguiler benefit immensely from all of your bomb auras
A 2/2 for three that nets you a Forest is already playable, so it wouldnt take much to vault Nissa into staple status
This card can single-handedly change the outcome even if the board is stalled: It doesn't need to attack to start burning everyone to death