Once per turn, you can send 1 "Ojama" card from your hand to the Graveyard to Special Summon 1 "Ojama" monster from your Graveyard. While you control a face-up "Ojama" monster, switch the original ATK and DEF of all monsters on the field. ("Ojama" can include "Ojamuscle".)
Clearly Ojama Country was made to support the Ojama Archtype, mostly it's fusion monsters by switching their attack and defense, so that you can use them as beaters. They can also be revived as long as you have Ojama cards in your hand to discard.