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Add to that plenty of ways to put additional +1/+1 counters on it and many smaller synergies throughout the Standard format, and I expect Walking Ballista to be a Standard Staple from the start

While getting a nine isn't the worst thing in the world, it limits the potential short-term value for those interested in resale value

Red Red generally has the most damage-based removal of any color

As soon as one player breaks ranks and refuses to pay their taxes, everyone else follows suit, leading to lots of lovely card draw for you

Iron Man's last ability will overwrite any previous effects that set a permanent's power and toughness to specific numbers