User blog comment:LionHeartKIng/New open-source archetype/@comment-16107481-20160212221613

There will be one and only one card for every Summoning mechanic. BUT, in the case of Relay and Impure Monsters, there will be 1 of any kind possible; for example, 1 Relay Synchro, 1 Relay Xyz, 1 Relay Ritual, etc. Same for Impures.