I will post two alternatives to this deck soon. For white and black splashes.
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Tried green as well as splash, totally disagree with the comment that thragtusk is weak, but Garruk is indeed an easy target and doesn't add much. Besides, he is like impossible to cast.Green cards would be: Thragtusk, Farseek, Urban Evolution, Huntmaster of the Fells, Progenitor Mimic, Mana Bloom, Ranger's Path, Borderland Ranger... Stuff like that. But this doesn't add to the strength of the deck. Key rule of Highlander is that all cards you draw must make a difference.
Agree, white or black seems better as splashes UR alone just hasn't got enough against hexproof/Indestructability.