Is Temper legal in Standard, Modern, and Commander?

Temper is legal in: Legacy, Vintage, Commander.

Temper

Q: What type of card is Temper?

Temper is an Instant. Its oracle text reads: "Prevent the next X damage that would be dealt to target creature this turn. For each 1 damage prevented this way, put a +1/+1 counter on that creature."

Instant

Prevent the next X damage that would be dealt to target creature this turn. For each 1 damage prevented this way, put a +1/+1 counter on that creature.

Set Stronghold

Rarity Uncommon

Mana Value 2

Artist Matthew D. Wilson

Collector # 20

Scryfall Gatherer