At the beginning of your upkeep, look at the top card of your library. You may put it into your graveyard. Then if you have seven or more cards in your graveyard, you may transform Search for Azcanta.
For more information on double-faced cards, see the Ixalan mechanics article (http://magic.wizards.com/en/articles/archive/feature/ixalan-mechanics).
If you have seven or more cards in your graveyard, you may transform Search for Azcanta while resolving its triggered ability even if you choose not to put the top card of your library into your graveyard.
If you donâ€™t put the top card of your library into your graveyard while resolving Search for Azcantaâ€™s triggered ability, youâ€™ll leave it on top of your library (and probably draw it during your draw step).
If a seventh card is put into your graveyard by something other than resolving Search for Azcantaâ€™s triggered ability, you wonâ€™t transform it yet. Youâ€™ll have to wait until your next upkeep.
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