The current rule(CAR 166A) reads:
(h) if the pilot takes off from, or lands at, the aerodrome, the pilot must take off or land into the wind if, at the time of the take-off or landing:
(i) the pilot is not permitted under subregulation (5) to take off or land downwind; and
(ii) it is practicable to take off or land into the wind.
Under the current rules you can takeoff with a tail wind but down slope if taking off up the slope is not practicable. Under the new rules this is an offence.
Here's another one:
(1) The pilot in command of an aircraft for a flight contravenes this
subregulation if:
(a) the aircraft is flown in meteorological conditions other than
IMC; and
(b) during the flight, IMC conditions are simulated; and
(c) a requirement mentioned in subregulation (2) is not met.
(2) The requirements are the following:
(a) a pilot (the safety pilot) must:
(i) occupy a pilot seat fitted with fully functioning flight controls; and
(ii) have adequate vision forward and to each side of the aircraft;
(b) a pilot (the second pilot) flying under simulated IMC must occupy a pilot seat fitted with fully functioning flight controls;
(c) the safety pilot must hold one or more of the following:
(i) an instrument rating;
(ii) a flight instructor rating;
(iii) a flight examiner rating.
CAR 153 only requires that the safety pilot is a competent pilot and CAO 40.0(2.7) only requires that the safety pilot hold a pilots licence other than a students and is endorsed on the aircraft.