Is Coral Fighters legal in Standard, Modern, and Commander?

Coral Fighters is legal in: Legacy, Vintage, Commander.

Coral Fighters

Q: What type of card is Coral Fighters?

Coral Fighters is a Creature — Merfolk Soldier. Its oracle text reads: "Whenever Coral Fighters attacks and isn't blocked, look at the top card of defending player's library. You may put that card on the bottom of that player's library."

Creature — Merfolk Soldier

Whenever Coral Fighters attacks and isn't blocked, look at the top card of defending player's library. You may put that card on the bottom of that player's library.

Set Mirage

Rarity Uncommon

Artist Steve Luke