5 cards where (the card is available on Paper) and the power = 13

Death's Shadow (Double Masters #82)
Elbrus, the Binding Blade // Withengar Unbound (Dark Ascension #147)
Elbrus, the Binding Blade // Withengar Unbound (Dark Ascension #147)
Emrakul, the Promised End (Eldritch Moon #6)
Krosan Cloudscraper (Murders at Karlov Manor Commander #175)
Ludevic's Test Subject // Ludevic's Abomination (Innistrad #64)
Ludevic's Test Subject // Ludevic's Abomination (Innistrad #64)

This search is finished. Now the real work can begin.