The following Canadian cards earn points that can be converted to Iberia Plus Avios:

American Express Cobalt Card (C$1 = 1 to 5 Avios)*
American Express Gold Rewards Card (C$1 = 1 to 2 Avios)*
American Express Green Card (C$1 = 1 Avios)*
Diners Club Club Rewards Mastercard (C$1 = 0.80 Avios)*
HSBC World Elite Mastercard (C$1 = 1.2 to 2.4 Avios)*
HSBC Premier World Elite Mastercard (C$1 = 1.2 to 2.4 Avios)*
Marriott Bonvoy™ American Express®* Card (C$1 = 0.67 to 2.08 Avios)
mbna Best Western Rewards Mastercard (C$1= 0.20 to 1 Avios)
RBC British Airways Visa Infinite Card (C$1 = 1 to 2 Avios)*
RBC Avion Visa Infinite Privilege (C$1 = 1.25 Avios)*
RBC Avion Visa Infinite Card (C$1 = 1 to 1.25 Avios)*
RBC Visa Platinum Avion Card (C$1 = 1 Avios)*
The Platinum Card from American Express (C$1 = 1 to 3 Avios) *
* - Must convert to British Airways Executive Club first and the transfer to Iberia