Field spells used to be cards that gave your monsters a slight boost, while transforming the battlefield into some sort of mountain or forest (well, at least it did in the anime!) Nowadays, Field spells add a whole new level of consistency to your deck, allowing you to search additional monsters, special summon for free, or lock your opponent out of certain effects
Like any easily spammed Level 10 monsters, it makes a great material for a Rank 10 Xyz play
Sword of Vengeance [Cat deck]: A great way to make one of your cats almost like Baneslayer Angel (Flying, first strike, lifelink, protection from Demons and from Dragons)
Lilianas Triumph As formats reach back, removal that does not target becomes increasingly more important
With this backdrop, I recently opened a couple prerelease packs and one bundle of Ikoria the product netted me around 20 booster packs
Trap Hole was probably a decent card