The Flying Fortress
The bag of this giant fortress gliding through the sky contains 30 marbles: 15 red ones and 15 green ones.
Falling Debris: When the flying fortress is damaged in battle by another army and has to replace marbles from its bag with black marbles, then the other army has to replace the same number of marbles with black marbles.
The Lord of the Flying Fortress
The bag of this arcane architect contains 20 marbles: 5 green ones, 12 blue ones and 3 white ones.
Magical Architecture: The lord of the flying fortress can treat blue marbles drawn to avoid damage to the flying fortress during battle as his choice of red, green, or blue.
Riches of the Sky: Instead of paying gold for the upkeep of the flying fortress, the lord of the flying fortress has to succeed at a magic challenge (three marbles). If he does not draw at least one blue marble for this challenge, the fortress counts as unsupplied and has to replace five marbles from its bag with black marbles.