You take the 4 consecutive first round lottery picks. Trading 4 consecutive first round picks is flat out crazy stupid. Nuttersville. So that means the GM parting with them is running his team badly. Which means you are getting really good lottery picks.
That GM who takes Marner and gives us 4 hall of famers has a team full of Patrick O'Thuggos and is busy trying to score from the penalty box, whereas the Leafs, with the golden age of reason in Leafs management through an in-house analytics department, is trying to win with a thinking man's hockey and keeps drafting and developing those European Ivan Svenskys.
It's against the rules in the NBA to not have at least 1 first round pick of any description (could be from another team) every 2 years. You cannot go 2 years without a 1st round pick in the NBA because the consequences are so catastrophic for the team losing the picks and the team getting them is pissing themselves laughing! "
In total, the Stepien rule prevents NBA teams from making any transaction that could leave them without any first-round picks in any two consecutive future drafts in any scenario for any reason." CBA Encyclopedia: Stepien Rule
The rule reads
Losing 4 consecutive first round picks in the NHL is completely against the rules of the NBA unless you acquire other first round picks from someone else. And trading first round picks hurts your ability to sign restricted free agents.
If some idiot gives you 4 hall of famers, you take them.
CBA Encyclopedia: Stepien Rule