Now that the trade deadline has passed, there are a new set of rules in play for player movement in the NHL. Most of this is covered on Cap Friendly in their CBA section, but with some Leafs-specific context, here are the rules:
Roster Limits
The 23-man limit is gone, but the salary cap isn’t. Teams can have any number of players on the roster who will fit under the cap.
However:
Recalls and Reassignments
There are limits on recalling players from the AHL and for sending players down. Teams are limited to four regular recalls from the AHL.