In case you are not familiar with this mechanic in the videogames, you will find characters throughout the story who are masters of one specific type of Pokmon and will challenge you with their thematic team
You can banish this card you control, plus 4 monsters from your hand, field, and/or GY (1 each with "Pendulum Dragon", "Xyz Dragon", "Synchro Dragon", and "Fusion Dragon" in their names)
Often, Edea The heavenly Squire will summon Eidos The Underworld Squire, giving you two bodies on the field for one summon and will allow you to easily go into a Tribute Summon
I counted all the differences: take the 38,768 unique cards, account for 58,779 in additional foils and treatments, plus 718,172 non-English cards, 5,278 non-playables (the tokens, art cards, etc.), 755 playtest cards, Arena's 221,930 cards in their languages, and 29,252 MTGO cards and you arrive at our total of 1,072,934