If the attacking Digimon is destroyed or returned to the attacking player's hand by the card produced by the first Check, the attack ends at that point
Orzhov Aggro This is a Sealed deck that I went 3-1 with in a Limited PPTQ
Another opposite for these two cards can be seen with where the number 9 is on their number
See for yourself: I dont know about you, but I think the art on some of these cards looks awesome, especially The One Ring, which is listed as an indestructible artifact
Panharmonicon itself never actually triggers, it simply means anything that triggers from a creature or artifact entering the battlefield will trigger again
Free cards are so much better than cards you have to pay for, and being able to land this on turn five (or earlier) is sure to make you a target, but could also make you unstoppable