Cards

Cards are tactical items that you can use on your turn to provide various effects. At the start of each turn, you draw 1 card (some Artifacts, Overlords, or cards can change this), and at the end of your turn, you discard down to 3 if you have more than that. Cards require crystals to play, which are generated by crystal worlds. Your crystal meter fills at the beginning of each turn, and any unused crystals at the end of your turn are wasted.

Schemes
Schemes are special one-time cards that are added to your hand after meeting certain prerequisites for that mission, detailed on the card. Each Overlord has their own unique schemes.

Special cards
These cards are only acquired through certain Exploration events.