Is Tilonalli's Summoner legal in Standard, Modern, and Commander?

Tilonalli's Summoner is legal in: Modern, Pioneer, Legacy, Vintage, Commander, Historic.

What type of card is Tilonalli's Summoner?

Tilonalli's Summoner is a Creature — Human Shaman. Its oracle text reads: "Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) Whenever this creature attacks, you may pay {X}{R}. If you do, create X 1/1 red Elemental creature tokens that are tapped and attacking. At the beginning of the next end step, exile those tokens unless you have the city's blessing."

Tilonalli's Summoner

Creature — Human Shaman

Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.)

Whenever this creature attacks, you may pay . If you do, create X 1/1 red Elemental creature tokens that are tapped and attacking. At the beginning of the next end step, exile those tokens unless you have the city's blessing.