I have seen the overall frustration (and a lot of the time exaggeration) of the gap between those players who have got into the game at an early stage and managed to get their Panzer Dragons. I know that these cards are particularly useful and helpful for many maps, and I (as a Post Panzer Player (now abbreviated to PPP)) have felt this frustration as well. At this point in time, the only way to get a Panzer Dragon is through sailor miles, but for many, this is not achievable without adding copious amounts of money into the game. I think that it would be fair to:
a) Have a Card Store for higher tier cards (Panzer, Aphrodite, Greater Demon etc) for a FIXED price PERMANANTLY. So the Panzer price may be for instance 750 gems giving the opportunity for players to get this card without a lot of sidetracking and wasted time.
OR
b) Have a random Panzer map appear once every say, 1 to 2 weeks for 2 days WITHOUT notice, so players must be vigilant to find these maps and WILL spend energy potions, revives etc to complete these maps in a small amount of time to grab these cards while they still can.
Either of these ideas would probably draw extra revenue (for Playmage) and give PPP's a chance to get ahead in the game more without taking out many obstacles and revenue for you, Playmage. Many people wold love to have more options with grabbing these cards, especially for those PPP's who do spend gems a lot but still can't gain access to these legendary cards.
Just my piece