When Obsidian Plains enters the battlefield, sacrifice it unless you pay 1 life.
: Add or to your mana pool.
: Add to your mana pool. Put Obsidian Plains on top of your library.
, , Sacrifice Obsidian Plains: Target player gets a poison counter.
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: Add 
or 
to your mana pool.
to your mana pool. Put Obsidian Plains on top of your library.
