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I think I played in 2 Kaladesh prereleases and from memory I have one of the red dice in a drawer somewhere
I'll check tonight when I get home

Edit: Yep it's in my bag
If I find you at Niagara...

As someone who has frequently tested RB Goblins with discard I would agree with this
Boarding duress to hit the opp's thoughtseize doesn't make sense and the black splash versions basically never...