if I remember well, Zeus will cost you 20000 guild points when it appears in the shop. Ice pinochio costs 2500 guild points in the shop. It's actually used to skill Black Beard if you have that card. Chimeara drops on the 200 diamonds recruiting feature (six star and above). The clown has been a special event card about two years ago. Don't know if you can get him with diamonds.
thats 2 million coins. I dont have anywhere near that many. I'll have to run king solomons mines and save the GP instead of buying 2-STAR dragons in the shop.
Never have less than 2 million coins in the bank. There's a lot of good cards that sell for 20,000 GPs in the shop. Buying these is critical to powering up early in the game.
HP beasts (Naga, Snake Spirit, Werewolf, Sea Serpent, Harpy) are all good, because many times you simply need more HP on your team to survive, and you can't always rely on booster buddies for that. Hecate is decent HP for the ignore-def 20K hit. Some like Thetis also (skill is 1.5x water-type boost)
If you don't already have a heal all card, GS does occasionally have the light Pinocchio which is worth getting. Ignore the good looking level 5 card which have leader skills of increasing chance. I also use GS for rainbow maps and some of the other supplies.