Dungeon Worm is Lv5 so requires one tribute to be tribute summoned.
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Monsters cannot manually change their battle position after attacking, but Medusa Worm has an Ignition Effect which flips it face down. You can flip summon Medusa Worm in main phase 1 to get the effect, then attack in the battle phase, then activate the Ignition Effect in main phase 2 to flip it down again.
Onyx
oh, this is one of my favorite cards! if you flip summon it, you can destroy one monster, then you can flip it face down again so you can do it again next turn. its realy good in an earth deck like mine! but i is not like man eater bug. you have to flip it, not have a monster attack it. its not a flip effect monster. -lone wolf
well a fishing rod and a worm there
well bang on the inside or the underwater caves and one of them has a worm, its one of the top left ones i think. i said I THINK! i dont know for sure.