Ravensburger has done a great job of getting us all excited
The best example is the Fallout : Vault Boy Mana Vault: Its currently the most expensive Secret Lair card, selling in the $1,000+ range
Once a creature that has reach because of Sphere Grid's last ability has blocked a creature, removing all +1/+1 counters from that creature or causing Sphere Grid to leave the battlefield won't cause that creature to stop blocking
The problem is that Im inclined to generate ink (the games version of mana) on every turn, which burns one card from my hand right off the top
Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand
Remember, even without a Detective, Plutos ability still puts the Item on the top of the deck if not your hand