yugioh eidolon deck Grand Archive Radiant Origins Pantheon Deck: Kongming, Fel Such cards are denoted with the PANTHEON flag on the bottom right corner of the card. Invoked Shaddolls of Theseus -

Because delve isn't an alternative cost, it can be used in conjunction with alternative costs, such as flashback

Subconsciously or not, this aligned perfectly with the unveiling of the contents of the Mystery Booster

Another angle are the WotC-designed eldrazi spawn and scion tokens that you create through cards like Pawn of Ulamog, Basking Broodscale, and Awakening Zone

Not worth hunting allocation on ETBs unless you specifically want the promos

I believe there are different size boxes for them, SuMo definitely has a 200 pack box release, and as far as others go, I think there is also a 60 pack box, and possibly a 100 or 120 pack box