Is Goblin Trapfinder legal in Standard, Modern, and Commander?

Goblin Trapfinder is legal in: Historic.

Goblin Trapfinder

Q: What type of card is Goblin Trapfinder?

Goblin Trapfinder is a Creature — Goblin. Its oracle text reads: "When this creature dies, seek a creature card with mana value 3 or less. That card perpetually gains haste, "This spell costs {1} less to cast," and "At the beginning of your end step, sacrifice this creature." Power/Toughness: 1/1"

Creature — Goblin

When this creature dies, seek a creature card with mana value 3 or less. That card perpetually gains haste, "This spell costs less to cast," and "At the beginning of your end step, sacrifice this creature."