Unit tokens can be synthesized in the units formation screen to create a new unit. How to get tokens:
1. Altar: Use keys or diamonds at the altar to summon unit tokens or whole cards.
2. Shop: Specialized currency can be used at various shops to exchange for unit tokens.
3. Underground stages: Gain as loot from playing Underground stages, or acquire from stage star chests, special events, and more.
4. Other methods: Fiestas, login rewards, limited wishes, and other events.