You can start creating Pokemon cards immediately without any registration
The other part of Sigurd that makes him particularly good is that anytime a lore counter is added to one of your Sagas, you can put a +1/+1 counter on another creature you control
An opponent might get out a first turn Jackal Pup, follow it with a second turn Dauthi Horror, and cap those off with a Mogg Fanatic and Dauthi Slayer on turn three, but your third turn Propaganda would ensure that you didn't take a full seven damage to the noggin on turn four
The Darkness-types in Genetic Apex are instead Generation I Poison-types like Zubat and Koffing, which were categorized as Darkness in the TCG at the time of the game's release (as opposed to their previous classification under Grass or Psychic)
Following this spell immediately with a 1-mana cantrip, removal spell, or even a 1-drop creature should be a very good turn for you, whether you make tokens or spread +1/+1 counters around