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Tycho could be usefull if he wouldn't ''force'' your whole Blood Angels army to use his LD. Sure it looks good on paper, but all you need is one IG psyker squad abusing rules-as-written and blam, you got a Blood Angels army with LD2.
Trivia: Tychos' name is probably inspired from the danish astronom Tycho Brahe, who had his nose cut off in a duel and replaced with one of silver. (Like Tycho and his mask)