UR Ultra Rare Mara of the Nordic Alfar X DARK Level 2 [ SpellcasterTunerEffect ] ATK 1000 DEF 500 When using this card as Synchro Material, the other Synchro Materials must be 2 "Nordic" monsters in your hand
Lower Text - Promo Info booster ULTIMATE POWER [BT-02] CLOSECLOSE BT2-096 Option The Ray of Victory Color Blue Form - Attribute - Type - DP - Cost 5 Digivolve Cost 1 - Digivolve Cost 2 - Upper Text [Main] Return 1 of your opponent's level 5 or lower Digimon to their hand
Cards like Academy Manufactor, Tamiyos Journal, and Five Hundred Year Diary seem like good cards to include that specifically care about Clue tokens
Also, since the summoning condition is "you control no monsters, or only Xyz Monsters," if the opponent Special Summons a "Bystial" monster as a graveyard counter when they go first, you won't be able to Special Summon "Exosister Martha" on the return turn, so anyway, the compatibility between this card and "Bystial" is not very good
When in doubt, go slightly larger, not smaller: A 12 mm surplus is fine
Compare the right edge of the art box against a known Unlimited copy