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
Being able to try again for another four is sweet too
Form a crew by grouping the 6 cards of the same family and beat your opponents
6 Alesha, Who Smiles At Death Printed in Fate Reforged, while Alesha, Who Smiles at Death may be a red card, due to the Orzhov cost (white/black) of its ability, it functions as a Mardu commander
This is sort of the Labyrinth is a potent piece of colorless mana ramp, so the decks that may seek to play it might be a little bit more narrow than Urzas Saga, but it accelerates decks like Tron and Affinity beyond what any other piece of ramp can currently do
Alas, they didnt quite get there