Is Runeflare Trap legal in Standard, Modern, and Commander?

Runeflare Trap is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Runeflare Trap?

Runeflare Trap is an Instant — Trap. Its oracle text reads: "If an opponent drew three or more cards this turn, you may pay {R} rather than pay this spell's mana cost. Runeflare Trap deals damage to target player equal to the number of cards in that player's hand."