Abyssal Harvester is worth noting as another demon to pair with Unholy Annex, but I think not having decent stats or a powerful enter the battlefield ability make it just not good enough
Read the Japanese code itself, do not translate the word
The downward trajectory of the value of rare and highly prized Pokmon cards is on full display on price charting sites such as pricecharting.com, where for example, it can be seen that a PSA 9 1st edition Holographic Blastoise card from the Base Set which in February 2021, would have cost a collector a little over $8,000, has a value today of $3,750
The indestructibility makes your board immune to most conventional board wipes
The "Number 1" sign in the lower-left corner of the card image indicates that this is a 1st Edition card
I selected that version, and the site took me to that Yisans product page