legendary duelists soulburning volcano booster box Yu-Gi-Oh Duelists: level strategies of the last decade Yu-Gi-Oh! - Legendary Duelists 10:

All the Transformers cards that can be opened are double-faced legendary creature/artifact (robot/vehicle) cards, and they all have an alternate More Than Meets the Eye cost, which allows you to cast the back side of the card (from any legal zone) instead of the usual front side

Or maybe you still need that Drop of Honey for your collection

So as long as you're not too far behind, this tutor is excellent

Compleat with untap shenanigans, the ability to ping herself and free-cast your own cards or voltron up and free-cast opponents' cards dare they block, and even being the first card on this list to have black in the color identity and not just be mono-blue