They do not swarm the field, but rather control it by using effects that help clear the field, and sometimes uses the opponent's own monsters against them as tribute fodder
At MUR level, Japanese cards occupy a tier that English cards simply do not have
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The art for Feed the Serpent really hammers home the sheer scale of Koma, and the flavour text adds so much to it: before you die, you're driven mad by being faced with the size of the Cosmos itself
Although it was originally selling at heights that put it at the top of the list, since Journey Togethers full release, the Ultra Rare version of Lillies Clefairy ex has dropped massively in value