Blight bug lets you discover a card and comes with a 1/2 body which is a useful tool. If Blight Bug dies before you get to use that card, it becomes a blight bug and you can play the bug to discover another card and gain value. Note: also combos great with effects that let you double up on battlecries or trigger deathrattles.
2
Deck would have to be carefully crafted, as some rarities rely more on battlecries than others.
2
Pirates seems the obvious answer. Just to be different, I'll include all of Stranglethorn Vale!
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Token:
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It would include itself, so at least 2 damage when played alone.
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15
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I thought this could be interesting. It has taunt when first played, but if it takes any non-lethal damage, it becomes immune but can then be bypassed (as the taunt no longer works). The priest could then trade favorably and heal it to remove the immunity and restore the taunt. Dealing 3+ damage will kill it outright.
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A "mini" version of Void Terror. Battlecries trigger before the minion enters play, so the effect will go off before the minion dies from having zero health.