http://magic.tcgplayer.com/db/print.asp?ID=4468
This is the elaboration of UNO principle.
But in my personal words, I need to introduce two concepts -- efficiency and effectiveness.
Effectiveness refers to the magnitude of how powerful you deck is. It represents the diversity. And efficiency refers to magnitude of how much resources you implement to achieve the same level effectiveness. It represents how synergetic your deck is.
No matter what the game principles are, they primarily should achieve the same goal which is to increase the win rate.
Assuming that you deck is 100% efficiency with all 4 copies of cards in a 40 deck, if you take out one card out of those 4 copies of cards to rather increase one uno card, your efficiency will alter to 39/40 instead of 40/40(100%). Actually, you do weaken your deck's efficiency by adding a uno card. But the magnitude of decreasing in efficiency is such small that we can omit the difference.
In effectiveness aspect, given that this uno card can cope with the situation with which originally you have no way deal, it increase the diversity so that you have a chance to win some specific decks that originally you can never win. From 0 to 1, actually the magnitude of increasing in effectiveness overwhelms the magnitude of decreasing in efficiency from 40 to 39. Therefore, the behavior to implement uno theory is essentially to sacrifice efficiency to trade for effectiveness.
In this combo-synergy based deck, we should try our best not to decrease the efficiency because this deck cannot stack up to other decks which run with just solid non-combo cards if the combo chain is broken. So that's why I only have 3 uno cards. SoV can help you against
Zhanna, Rogue, and
Amber, which basically are troublesome to this deck.
This is just my personal opinion, hope it helps
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