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The Incredible Hulk leaves the battlefield before that ability resolves, and you won't put three +1/+1 counters on him

I think copy effects are probably pretty good with your Commander, if you cast Rite of Replication on your Commander you still get 5 copies ETBing and dying, which should clear out hands and serve as a huge board wipe (you get 5 triggers each of the ETB and death trigger, if you have 3 opponents left 2 of them have 1/4 of their permanents and one has half left, similar for their hands

Is this creature easily replaced by any other creature

And heres my list to get your deckbuilding juices going

Youre just borrowing something