Doing so would have allowed WotC to economize the number of different sheets for printing the set to only three (including holos), plus those required for the starter decks and theme decks
Grow your army, draw cards, or deal a ton of damage to your opponent
While they are less expensive compared to SARs, Supporter cards that feature a large illustration of a popular female character can still increase in price
Platinum Secret Rare : TCG-exclusive rare card found in the 2014 Mega Tins
Using Removal If you dont have enough creatures to block with, a good removal spell will do the trick
Consumer protections: Although highly unlikely, if a scammer managed to read and then use your card, such purchases would likely be intercepted or refunded according to your card issuers fraud policy