Is Leyline of Abundance legal in Standard, Modern, and Commander?

Leyline of Abundance is legal in: Modern, Legacy, Vintage, Commander, Historic. It is banned in: Pioneer.

Leyline of Abundance

Q: What type of card is Leyline of Abundance?

Leyline of Abundance is an Enchantment. Its oracle text reads: "If this card is in your opening hand, you may begin the game with it on the battlefield. Whenever you tap a creature for mana, add an additional {G}. {6}{G}{G}: Put a +1/+1 counter on each creature you control."