Is Breath of Dreams legal in Standard, Modern, and Commander?

Breath of Dreams is legal in: Legacy, Vintage, Commander.

Breath of Dreams

Q: What type of card is Breath of Dreams?

Breath of Dreams is an Enchantment. Its oracle text reads: "Cumulative upkeep {U} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)Green creatures have "Cumulative upkeep {1}.""

Enchantment

Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)<br>Green creatures have "Cumulative upkeep ."