Grillby was added in Beta 2.8. Previous Versions can be found here.

When placed, it gives +1/+1 to all ally monsters on the board. This is essentially an upgraded version of Monster Kid.

Best used with a full board, with 0 ATK cards like Pyrope and Igloo to make them able to deal damage and avoid being instantly killed by cards like Madjick or Disco Ball.

Also works with 2 ATK cards like Mettaton and Dog House to prevent them from being killed by Muffet's Pet.