The term "defending player" in the myriad rules (or any other ability of an attacking creature) refers to the player the creature with myriad was attacking, the controller of the planeswalker it was attacking, or the protector of the battle it was attacking at the time the ability resolves
It's ramp abilities and removal tools made it a very strong ink choice when deck building
as Chishiro gathered information on the Mukotai threat, he had learned this name but little else
Examples include certs 71294671, 71294672, 71294673 (yes all 3 of these were sold by the same eBay seller and when I reached out to comment they said they were the original owner and got them at Nintendo World in 2005), and 89689485 (4 certs, or 25% of public certs)
These new cards are more than welcome, given running a main deck Rest in Peace often feels like overkill