I was playing a game as Master Yi

you go for enemy camp farming. And solo rift ( suicide)

Well bloodrazor on Yi is pretty much the same as Warrior: they're both good, but they're not really awesome... I think that riot screwed up a bit (again) this time since bloodrazor is a lot like Warrior: it really favors aggressive junglers too much, farm jungler can either go warrior and get the same benefits or, if warrior is bad on them, have to go bloodrazor or cinderhulk (and both of them just don't favor farm junglers in any way). Wile I quite like bloodrazor, an item based on old devourer (the first one) would've been a lot better for them, something like a kindred passive: make it reach just X amount of stacks off of normal monsters (with epic monsters, champions and scuttle crab giving more stacks) then after X amount make it so that only epic monsters and champs can give stacks, but MAYBE reduce the amount of stacks. This way farm junglers have some kind of reward for farming earlier in the game (getting some stacks for the later ganks), but then will have more reasons to actually start hunting bigger preys (champions and epic monster) since small monsters wouldn't give them any more rewards.