Is Undercity Troll legal in Standard, Modern, and Commander?

Undercity Troll is legal in: Modern, Pioneer, Legacy, Vintage, Commander.

What type of card is Undercity Troll?

Undercity Troll is a Creature — Troll. Its oracle text reads: "Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.) {2}{G}: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)"

Undercity Troll

Creature — Troll

Renown 1 (When this creature deals combat damage to a player, if it isn't renowned, put a +1/+1 counter on it and it becomes renowned.)

: Regenerate this creature. (The next time this creature would be destroyed this turn, instead tap it, remove it from combat, and heal all damage on it.)