This would ensure no new political parties arrive on the horizon in Canada.  The Greens for example, do not have 12 seats in the House of Commons.  The are not a recognised party.  They would not receive a per vote subsidy.  

Admittedly, these are not laws but parliamentary rules and the government can waive them; but that's even worse.  They can waive rules to allow recognition of a party that might siphon votes away from their opposition, but not grant recognition party to another that might compete with the governing majority.