At the end of the duel against a Spirit Beast deck, how come Apelion's ATK returned to normal during damage calculation?

At one point, Bladedge requires no tribute to Normal summon. Why?
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Bladedge issue: Elemental HERO Necroshade: Once, while this card is in the Graveyard, you can Normal Summon 1 Level 5 or higher "Elemental HERO" monster from your hand without Tributes.

Spirit Beast issue: Apelion the Tamed Sacred Spirit Beast: Must be Special Summoned (from your Extra Deck) by banishing the above cards you control, and cannot be Special Summoned by other ways (You do not use "Polymerization"). If this card attacks, it is unaffected by other card effects until the end of the Damage Step. During either player's turn: You can return this card to the Extra Deck, then target 1 of your banished "Spirit Beast Tamer" monsters and 1 of your banished "Noble Spirit Beast" monsters; Special Summon them in Defense Position.