When Quickling enters the battlefield, sacrifice it unless you return another creature you control to it's owner's hand.
2/2
MYTHICSPOILER.COM THE CYCLICAL MTG SPOILER
MythicSpoiler is a dedicated visual spoiler, designed to let you EXPLORE, DISCOVER and EXPERIENCE new Magic the Gathering sets in a simple, sortable gallery.
KHANS OF TARKIR 
CONSPIRACY 
JOURNEY INTO NYX 
BORN OF THE GODS 
THEROS 
MORE SETS
