I think comparing it to Burning Wish for Yawgmoth's Will is the best comparison we can make. Although when you take a Will turn how often are you strapped for mana? 3BR vs 3BB + gaining BBB is super tempting I think decklists are kinda full on tutors and we don't see much Burning Long as it is. Seeing it replace Imperial Seal or Grim Tutor maybe but not as a 4-of in any deck.
To compare this to Burning Wish is slightly erroneous in my view because:
A.) You don't have to necessarily splash Red with this card.
B.) Rituals cast it.
C.) Most importantly, this doesn't exile itself upon resolution so you can use it from your graveyard to find Tendrils. This is a mechanical difference between the two cards that can't be overstated. I think this card is mostly better than Burning Wish in a dedicated Will deck.
-Storm