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Originally these effects said they could be used at any time, but this caused some serious issues in gameplay

Its a complicated mechanic for sure, and one of the most individually complex mechanics overall, but not the worst mechanic if you ask me, and at the same time it's easy to grasp since it heavily draws from LotR lore

Ifrit for an example: G.F

It can be disruptive

It's also useful in the most competitive Commander decks that want to win within the first three turns

The Adventure side, Lupari Shield, is a solid defensive spell, giving all your Human creatures indestructible until your next turn, potentially letting them survive through multiple board wipes