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
If your shuffling method wasnt good enough, then there are going to be more clumps of lands and nonlands left over from the previous game, and you are more likely to get mana-screwed
It even promises card advantage to the enterprising knight-typal player
Card Set(s) -Green Uta- [ST-16] CARD VIEW P-057 | P | EVENT Fleeting Lullaby Block icon 2 Effect [Main] If your Leader is [Uta], up to 2 of your opponent's rested Characters with a cost of 4 or less will not become active in your opponent's next Refresh Phase
For example, Seal of the Guildpact V.2 (Near Mint) from Ravnica Remastered: Extras for 815.446,22 Euro will not be listed as the most expensive card on Cardmarket , because there is only one available on Cardmarket and this price is obviously a joke