You can only use this effect of "Ghost Ogre & Snow Rabbit" once per turn
It plays nicely into the AC Universes Beyond set's themes of myth, legend, and history, too, as that massive casting cost gets reduced equal to the total mana value of 'historic' permanents you control (that's artifacts, legendaries, and sagas)
during the End Phase, Special Summon from your Extra Deck, 1 "Number" monster with the same Type, but 1 Rank lower, as the Tributed monster had when it was on the field
Once per turn, when your Cyberse monster is targeted for an attack: You can have that monsters ATK/DEF become double its original ATK (until the end of the Damage Step), then, if that monster is in Attack Position, you can change it to Defense Position
The Asahi Shimbun