Sunantler Elk

{x}{w}: Gain X life.
Grace {1}{w}{g}{g} (Whenever a player casts a nonceartue spell, you may pay {1}{w}{g}{g}. If you do, attach this card to that spell's controller. It becomes an Aura.)
If Sunantler Elk is attached to a player, it looses "{x}{w}: Gain X life" and gains "At the beginning of enchanted player's upkeep, he or she may pay {x}. If they do, they may have target player gain X life."