(Obsidian Oasis isn't a spell.)
Obsidian Oasis enters the battlefield tapped.
, : Look at target player's hand.
: Add or to your mana pool.
: Add to your mana pool. Put Obsidian Oasis on top of your library.
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, 
: Look at target player's hand.
or 
to your mana pool.
to your mana pool. Put Obsidian Oasis on top of your library.
