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Cloning is Integrity's original Epic Spell card, able to make copies of selected monsters.
Since Beta 47.0, you can choose a monster from anywhere on the board and summon an exact copy of it on your side of the board, making it work exactly like Angel of Death. However, the spell can't be used on a Determination monster, making it more similar to Mad Mew Mew in that regard. The copy also will have its stats set to a new base of 3/3.
Since Beta 54.0, it can do this for a cost of 5G.