The Leafs roster is pretty bare, aside from the top chunk of each category. The prospect cupboard really only has 1.5 blue chips, as is the draft pick cupboard. UFA market looks like all the best options are the ones leaving the Leafs.
The most interesting names nominally available are 1 year away from UFA and have requested trades.
The only resource the Leafs are truly wielding with any 'depth' is one year of cap space.
Bolded categories are short at the NHL level
C: Matthews, Tavares | Holmberg, Der-Arguchintsev
LW: Knies | Robertson, Steeves, McMann, Clifford, Abbruzzese
RW: Marner, Nylander, Jarnkrok, Lafferty | Ellis
LD: Rielly, Brodie, McCabe, Giordano | Mete, Kral, Kokkonen
RD: Liljegren, Timmins | Villenueve, Niemela, Hollowell
G: Murray, Samsonov, Woll | Petruzzelli