Is Deadly Designs legal in Standard, Modern, and Commander?

Deadly Designs is legal in: Legacy, Vintage, Commander.

Deadly Designs

Q: What type of card is Deadly Designs?

Deadly Designs is an Enchantment. Its oracle text reads: "{2}: Put a plot counter on this enchantment. Any player may activate this ability. When there are five or more plot counters on this enchantment, sacrifice it. If you do, destroy up to two target creatures."