In MTG what other color should I have with blue to make a deck?

best blue control decks monoblue. trying add color waste of time.

since answer rated down give reasons why monoblue best.

1. no color screw if play monocolor. control relies heavily on getting drops , if throw in color that's splitting color base , making drops harder get.

2. of best control in game has multiple blue requirements , again, that's harder in deck more 1 color.

i want deck control deck, stopping them doing while destroy him. ideas?

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