Mono-blue decks lean on tempo strategies that focus on gaining a temporary advantage, often by bouncing opposing creatures since blue doesnt remove permanents as well as other colors
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Grabbing out creatures is pretty solid, and with proliferate you could potentially be turning out tokens of crazy large things
Keep in mind that if you have enough -1/-1 counters floating around, you can change his shape at instant speed, making him a very versatile and strategic commander
I guess that the extra damage from Ukkima, Stalking Shadows death could be enough to finish off an opponent, but if that doesnt end the game right there, Id rather keep my buffed up Ukkima on the field