Sundial of the Infinite [Magic 2012] Fifth Dawn during damage calculation in either

during damage calculation in either player's turn

Set: Elemental Energy Card type: Fusion/Effect Monster Rarity: Ultimate Rare Attack: 2500 Defense: 2000 "Elemental Hero Flame Wingman" + "Elemental Hero Sparkman" This monster cannot be Special Summoned except by Fusion Summon

Set: The Duelist Genesis Card type: Synchro/Effect Monster Rarity: Ultimate Rare Attack: 2700 Defense: 2300 1 Tuner + 1 or more non-Tuner monsters When this card destroys an opponent's monster by battle and sends it to the Graveyard

but I didn't expect it from the building itself

Sundial of the Infinite [Magic 2012] Fifth Dawn during damage calculation in eitherSet: Magic 2012 Type: Artifact Rarity: Rare Cost: {2} {1}, {T}: End the turn. Activate this ability only during your turn. (Exile all spells and abilities from the stack. Discard down to your maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)