Not sure if a flat 3 health or attack would make sense most of the time, but it can be fairly decent with deathrattle or divine shield... so a Shielded Minibot / Haunted Creeper / Druid of the Flame with flexibility. I think decks that can fulfill the requirement will probably play this. The biggest issue that it is a very bad curve play, unless you coin out two 1 drops or you play alley cat.
This is really good in a flood or zoo-like deck. Obviously the stealth, poisonous, windfury or cannot be targeted by spells generally won't be a good play but +3 health or attack, +1/+1, deathrattle and divine shield are all very good.