Hold on their, Chief! This is way too good. Breath of Life and Zombify just return creatures to play, but they cost more than this. I'm pretty sure this isn't a strictly white effect, either -- White concerns itself with enchantments and to a lesser degree, creatures, but graveyard manipulation is typically green or black, while messing with artifacts is a blue effect. Maybe have this return just an enchantment from your graveyard to play and it can cost

{W} or

{W} (If Replenish can do all enchantments for

{W}, that ought to be fair).