The ol' Doctor Teeth from Odyssey was a powerful card, to be sure, but its buffs were only temporary
Once your shambling horde reaches critical mass, boost their attack and send everyone else to the graveyard
Signatures can be annoying to verify, and not everyone is interested in them. And its not just artists who are known to sign cards, which makes it even more difficult to appropriately estimate a resale price for a signed card
The way the words were interpreted on the card, the Moderator completely ignored the order of operations
If left unchecked, Web of Life and Destiny can snowball fast digging five deep and putting a creature straight onto the battlefield each combat
Read the grading guide Penny sleeve plus a top loader or a semi-rigid holder, kept out of direct sunlight to protect the holo, and stored flat since full-art cards are prone to bowing