Feasting Troll King does just that, letting you cast a monstrous 7/6 vigilant trampler for free if you have three Foods to sacrifice, and the King himself is in your graveyard
then, if you have a Whispers in your graveyard, cast that one for another , and you gain much more power from your spells
Other variations are priced between $15 and $20, and the regular version of Elder Gargaroth is worth around $14
which is more of bonus for board stalls Melvin: Polly hurts everyone he loves
Sure, youll usually have to wait a turn for the recursion, but that is an insanely efficient rate for what is effectively 2 spells (more if youre lucky!), and if this isnt instantly slotted into the majority of decks that can play it, Ill be shocked