What is Calling Card?
Calling Card is an Anomaly you can find in Stage 4-6. You gain an Emblem that mataches a non-unique trait from the champion that is placed into the Anomaly. This can be quite powerful, since it can help you to find the Emblem you need to reach a prismatic trait like 10 Enforcer.
Normally you would utilize Legendaries with a unique trait to force a specific Emblem, but in Set 13 all of them have three traits, which means you are back to a 50-50 chance. However there are still some units that only have a single viable trait and therefore guarantee a specific trait.
Units with only one viable option
There is no Emblem in the game for the Emissary and Form Swapper trait, which means you can guarantee:
- Tristana -> Artillerist Emblem
- Nami -> Sorcerer Emblem
- Garen -> Watcher Emblem
- Jayce -> Academy Emblem
Other units from these traits like Gangplank, Swain, Elise or Ambessa all have three traits.