It can't be the target of the triggered ability of Mystic Sanctuary
Dont worry so much about timing and phases and permissions, just choose a card, any card, and put it on the table
In the formats you'll use these lands cards like Brainstorm , which let you mess with the top card of your deck, are fairly common
This is a good card, but one that requires being used in a specially-prepared deck - preferably a deck loaded with sorcery and instant cards for dealing damage, as opposed to lots of creatures
Once you're ready, Grond can help back up your army of Uruk-hai for the win
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