Is Hollow Specter legal in Standard, Modern, and Commander?

Hollow Specter is legal in: Legacy, Vintage, Commander.

What type of card is Hollow Specter?

Hollow Specter is a Creature — Specter. Its oracle text reads: "Flying Whenever this creature deals combat damage to a player, you may pay {X}. If you do, that player reveals X cards from their hand and you choose one of them. That player discards that card."

Hollow Specter

Creature — Specter

Flying

Whenever this creature deals combat damage to a player, you may pay . If you do, that player reveals X cards from their hand and you choose one of them. That player discards that card.