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Razorclaws robot mode ability says that when he flips to that mode he can attack untapped characters that turn as though they were tapped. If a character has Stealth when untapped, does Razorclaw treat them as tapped or untapped for the purpose of their Stealth?

The character will still have Stealth. Razorclaws ability changes the way that Razorclaw can attack but doesnt actually change the Tapped/Untapped state of other cards.
Source: Wizards of the Coast (2019-10-25)    【Link to Ruling】
Tags: Razorclaw, Predacon Leader