Good thing Comrie is a UFA then
If we are going cheap, he should be priority number one. Not a large enough sample size to get any kind of big money. May even get a Bunting contract.
If the Leafs are serious about giving Woll/Kallgren a shot, then that is the best move. Otherwise, Lankinen should not get more than a fully buried contract and is still fairly young himself. He had a nice run with Chicago last year, but has not been good for much of his recent stretch of games.
Otherwise, you have vets like Jones, Greiss, and Halak. None are overly amazing, but they should come for a cheap one year deal and should be better than the young guys we currently have. As a stop gap for one more year of development, that is a low risk, medium-reward type move we can make.
Holtby is the most attractive "backup" option out there, but also likely the priciest (you are likely not saving too much between Mrazek and him). He'd fit more if we went after Blackwood/Samsonov.