Unlimited Raise Dead

Unlimited Raise Dead: Infinite Ruin (無限の残骸(アンリミテッド・レイズ・デッド), Mugen no Zangai(Anrimiteddo Reizu Deddo)^?) is the name of two phenomena in which a non-stop loop generates essentially infinite beings.

Fate/hollow ataraxia

Avenger, granting the wish of Bazett Fraga McRemitz, loops a four day period over within a dream world, each time leaving behind a shade of himself. Over countless loops, this produces a countless number of shades.

Fate/EXTRA Last Encore

On the sixth floor of the Moon Holy Grail War, Rin Tohsaka and Rani VIII's Servants kill each other simultaneously just as Chakravartin shuts down the war, making the match a tie. In an attempt to bring about a true victor, they use the remains of their Servants to create Demi-Servant versions of themselves, but the two armies are locked in a stalemate and endlessly duplicate themselves to continue the fight. It requires the arrival of a third party, Hakuno Kishinami, to declare a winner and break the tie.