Is Cankerous Thirst legal in Standard, Modern, and Commander?

Cankerous Thirst is legal in: Modern, Legacy, Vintage, Commander.

What type of card is Cankerous Thirst?

Cankerous Thirst is an Instant. Its oracle text reads: "If {B} was spent to cast this spell, you may have target creature get -3/-3 until end of turn. If {G} was spent to cast this spell, you may have target creature get +3/+3 until end of turn. (Do both if {B}{G} was spent.)"

Cankerous Thirst

Instant

If was spent to cast this spell, you may have target creature get -3/-3 until end of turn. If was spent to cast this spell, you may have target creature get +3/+3 until end of turn. (Do both if was spent.)