Is Contractual Safeguard legal in Standard, Modern, and Commander?

Contractual Safeguard is legal in: Legacy, Vintage, Commander.

Contractual Safeguard

Q: What type of card is Contractual Safeguard?

Contractual Safeguard is an Instant. Its oracle text reads: "Addendum — If you cast this spell during your main phase, put a shield counter on a creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.) Choose a kind of counter on a creature you control. Put a counter of that kind on each other creature you control."

Instant

Addendum — If you cast this spell during your main phase, put a shield counter on a creature you control. (If it would be dealt damage or destroyed, remove a shield counter from it instead.)

Choose a kind of counter on a creature you control. Put a counter of that kind on each other creature you control.

Set New Capenna Commander

Rarity Rare

Mana Value 3

Artist Gaboleps

Collector # 14

Scryfall Gatherer