Karnless Mono Green

Obviously the deck is dead for competitive play in terms of the regional championship season. However, my brewing leaves me with a version which replaces Karn with shadowspear, puts polyk to the sideboard for gruff triplets, and ups the lair of the Hydra Count to 4 for early devotion and spear kills. Not as consistent without a wish but a shadowspear on a cavalier is still good. Something I'll be playing with. Any ideas or clear holes in the plan?