Obsidian Volcano enters the battlefield tapped unless you pay .
: Add or to your mana pool.
: Add to your mana pool. Put Obsidian Volcano on top of your library.
, Sacrifice Obsidian Volcano: Add to your mana pool.
.
: Add 
or to your mana pool.: Add 
to your mana pool. Put Obsidian Volcano on top of your library., Sacrifice Obsidian Volcano: Add to your mana pool.
