Is Mystic Might legal in Standard, Modern, and Commander?

Mystic Might is legal in: Legacy, Vintage, Commander.

Mystic Might

Q: What type of card is Mystic Might?

Mystic Might is an Enchantment — Aura. Its oracle text reads: "Enchant land you controlCumulative upkeep {1}{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.)Enchanted land has "{T}: Target creature gets +2/+2 until end of turn.""

Enchantment — Aura

Enchant land you control<br>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>Enchanted land has ": Target creature gets +2/+2 until end of turn."