Is Magmatic Core legal in Standard, Modern, and Commander?

Magmatic Core is legal in: Modern, Legacy, Vintage, Commander.

Magmatic Core

Q: What type of card is Magmatic Core?

Magmatic Core is an Enchantment. Its oracle text reads: "Cumulative upkeep {1} (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.) At the beginning of your end step, this enchantment deals X damage divided as you choose among any number of target creatures, where X is the number of age counters on it."

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.)

At the beginning of your end step, this enchantment deals X damage divided as you choose among any number of target creatures, where X is the number of age counters on it.

Set Coldsnap

Rarity Uncommon

Mana Value 4

Artist Matt Cavotta

Collector # 91

Scryfall Gatherer