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You can also use a die

Last March of the Ents costs eight mana which is a big risk if it weren't uncounterable

Thats not to say you cant play a multicolor deck to get the best use of Kaldring, but a mono-green deck can still find ways to make blue and black to cast the back half (any lovers of Gilded Goose in here?) Since Jorn doesnt need to connect to untap your snow permanents, you can do a few things to help protect him that should work with your main game plan

Cheatyface: A creature card that can be played from your hand onto the battlefield for free if you can sneak it onto the battlefield without your opponent noticing