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These are not necessarily stronger than other rarities (although they can be) when it comes to the card game, but they are harder to come by when opening packs

Regice still takes damage from attacks, as that is not considered an effect

The biggest reason though is that the end boards a Dragon Link deck can make are absolutely ridiculous in comparison to those of a Sword Soul board

And if you hit that natural 20...well, it won't happen often

Look at how happy and adorably fearsome Morpeko VMAX is on his lovely full-art ultra rare card

While they are significantly thinner than brands like Paladin, FFG, or Diamond, they are also cheaper