Is Mogg Assassin legal in Standard, Modern, and Commander?

Mogg Assassin is legal in: Legacy, Vintage, Commander.

Mogg Assassin

Q: What type of card is Mogg Assassin?

Mogg Assassin is a Creature — Goblin Assassin. Its oracle text reads: "{T}: You choose target creature an opponent controls, and that opponent chooses target creature. Flip a coin. If you win the flip, destroy the creature you chose. If you lose the flip, destroy the creature your opponent chose. Power/Toughness: 2/1"

Creature — Goblin Assassin

: You choose target creature an opponent controls, and that opponent chooses target creature. Flip a coin. If you win the flip, destroy the creature you chose. If you lose the flip, destroy the creature your opponent chose.