https://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=2432

Walking Wall 4
Artifact Creature - Wall
Defender
3: Walking Wall gets +3/-1 until end of turn and can attack this turn as though it didn't have defender. Activate this ability only once each turn.
0/6

This card is everything that Wall of Wonder wishes it was. Only losing one toughness for its ability means that it won't die if the opponent has a spare Squire or whatever to chump block with, and being colorless means it can be put in any deck. Of course even if it is better than other cards it's still a bit too slow for any deck trying to be competitive. This card is just about the right power level for casual play though.