It seems innovative enough, but the difficulty of tracking which doors are unlocked can be a headache (Strike three!), given other things that we need to track on the battlefield
We like this mix of abilities a fair bit, and while its not obviously overpowered, making things unblockable for two mana is a good rate
He has two abilities with the first allowing you to move a counter from any creature you control to any other creature you control at the beginning of combat
If the target creature is already tapped as the ability resolves, you will still put a stun counter on it
Combat Thresher lets you draw a card, Scrapwork Cohort makes creature tokens, Boulderbranch Golem gives you live, and Woodcaller Automaton can animate your lands
While a 5-mana 4/4 isnt good, making your opponents pay a significant tax any time they cast an instant or sorcery otherwise you get a copy of it for yourself can be pretty backbreaking