If it's a permanent card, put it into your hand
first, you count on your luck to get the card you want, and second, its impossible to get booster packs for older sets
Kellan, the Fae-Blooded One of just two legendary creatures with Adventure, Kellan, the Fae-Blooded provides a unique challenge to your deckbuilding skills and your ability to track your commander tax
I wouldnt exactly call that a downside

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The card begs the oft-asked question, In the absence of an objective rule structure, do we all become Squee? The most obvious use of the card is to strengthen the waning popularity and power of U/R Storm in Modern (for a good list pre-Faithless Looting, see the list that I cited in my last article)