Leyline of Mutation 
Enchantment
If this card is in your opening hand, you may begin the game with it on the battlefield.
You may pay 
rather than pay the mana cost for spells you cast.
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL