Personally, running an SoP/Fractal/RoL deck, I honestly don't run into a lot of problems regarding the destruction of SoP, and it is a very powerful card. However, considering it's not stackable, players rarely put many of them in their deck, making any amount of PC early on potentially devistating to the player's strategy. Honestly, compared to SoF, which has the potential to create basically immortal creatures at full power (requiring PC before CC), it doesn't seem too OP to me. Of course, when the card is used with "patience" while remaining uninterupted, it's detrimental to the opposing player's game. Which, in a way, all shards are when used properly and effectively.