Rules FAQ:
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Note that Roose's ability checks his current STR, not his printed STR, so all buffs from Winterfell, Needle, etc. apply.
- Although the wording is somewhat unusual, it works just like any other "do X to do Y" ability, i.e. you sacrifice Roose and choose targets first, and then your opponent can cancel the kill effect with Treachery. (Source)
NB: you can't have him duped and then sac a dupe to make it work, have to discard then re-buy him. "for the north" and "ice" are nice additions with winterfell castle and winterfell to get him up to 9 STR. Watch that make your opponent shiver!
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Praetorian1011
43
Keep in mind that you lose the STR bump on Roose if you trigger Ice first.
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sabrefox
8
And if you don't trigger ice, ice will be gone before you can trigger it? :P
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Megamannen
1
It will go into your hand, yes.
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mplain
238