Ace Spades Speculation (Secret Rare) [BLTR-EN039-SeR]

1 monster with 2500 or more ATK + 1 face-down Defense Position monster with 2500 or less DEF
You can only Special Summon "AceSpades Speculation(s)" once per turn. You can Tribute 1 Attack Position monster and 1 face-down Defense Position monster; Special Summon this card from your GY. This card gains the following effect based on its battle position.
• Attack Position: Gains ATK equal to the highest original ATK among monsters your opponent controls (your choice, if tied).
• Defense Position: Cannot be destroyed by battle or card effects.