Thats because you can do combo-ish things with Birthing Pod, and it causes you to select your creatures a little differently than you would otherwise
These two revealsAvatar Aang on June 20 and Yue, the Moon Spirit on July 26prompted huge runs on old Ally synergy cards from previous Zendikar sets, including Harabaz Druid
"But most of the holos are going to have silvering across the top and the right side of the border." In terms of the common issues found on these cards, Browning notes that it's mostly "surface condition versus edge wear and factory nicks." For example, besides the aforementioned silvering, he often sees print lines on the cards as well
Some want as many creatures on the board as possible for a multiplicative bonus to each equal to their quantity
He is then typically still in play afterwards which in turn keeps you at least even and can often lead to a win like Martial Coup
As part of their explanation, Bandai mentions that any card from a forbidden block group can return to legal status should said card be reprinted in a newer set with a new block number