In the absence of a true ace, and with the way Schneider typically uses the bullpen, I think a high leverage reliever is mandatory to add at the deadline. I'd be shocked if any of the current SP is allowed to face a lineup for the 3rd time in a playoff series regardless, so stacking up high leverage arms out of the pen is a good idea. If you're going for the 2015 Royals model, then go all in. Stack the pen up.
There doesn't appear to be a top of the rotation arm available so tough to see where the rotation add is going to come from. I still think Sandy is fixable, and if you put him in front of the Jays defense, along with Pete Walker who has a decent history of helping veteran starters, he seems like someone who the Jays could benefit from. The question is whether you get that benefit in 2025, or if it's more of a 2026-27 play. Either way, that's the closest thing to a TOR starter available. I don't think you can be satisfied with Scherzer whose thumb could explode at any moment and Lauer who a year ago was in the KBO. Maybe you can get by with that, but it would be asking a lot.
Hitting to me is a "depends on who is available and for what cost" decision. It's not mandatory to add there if everyone is back healthy and DS is a MLB player again, but Santander to me is the biggest wild card. You absolutely need power in the playoffs. If he's out for longer than expected, then I think you have to get a power bat somewhere.