Here's a (likely incomplete) list of units who will double gil if you bring them with their proper passive unlocked:

• Xon (must have Master Thief 2)
• Chow
• Explorer Aileen
• Lara Croft
• Montana (friend unit)
• Paul (friend unit)
• Pirate Jake
• Annika Svennson
• Václav Koller

Not an exploit

Also don't forget that you can quit out and redo the vault each day to reroll which stat pot appears. It costs 5 NRG each time and you can do it as much as you want.

Pop ups

If you TMR farm beware the popups. I had one that wanting to send me to the Elbis bundle and one that wanted to send me to the vault of hidden treasures. They're coming back with a vengeance.

Free Summons

We also have some free daily summons, both just a normal pull banner and the summer tickets.