Is Giggling Skitterspike legal in Standard, Modern, and Commander?

Giggling Skitterspike is legal in: Legacy, Vintage, Commander.

Giggling Skitterspike

Q: What type of card is Giggling Skitterspike?

Giggling Skitterspike is an Artifact Creature — Toy. Its oracle text reads: "Indestructible Whenever this creature attacks, blocks, or becomes the target of a spell, it deals damage equal to its power to each opponent. {5}: Monstrosity 5. (If this creature isn't monstrous, put five +1/+1 counters on it and it becomes monstrous.)"