Second, it's the most obvious inclusion in any Spider deck, so savvy opponents will assume you have it and play around it accordingly
That said, the typical numbers I see at my local stores are one additional booster pack for participating, and one extra booster on top of that for each best-of-three match that you win
Vagavoth, Harrower of Souls is our face commander and, as well as having a ward cost of 2 life, it has flying and both gets a +1/+1 counter and draws a card the first time an opponent takes damage on their turn

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1: Creatures can't be blocked this turn