About which part? Blood frenzy is widely touted as the best draw engine in the game and it gives you 1 extra card per turn for a mandatory cost of 1 life and no burst draw ability I.e it's a dead play on the turn you cast it.
AoC costs 4 but gives you 3 extra cards per turn and it's cost is optional. With BF you draw 2 cards a turn, with AoC you draw 4. Cost is higher but you'll never be killed by your own AoC pinging you and you can always just not activate it is you don't need the cards. BF doesn't have this flexibility. Oh, and you can use it immediately for burst draw so it's not a wasted turn.
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