(: Add or to your mana pool.)
Obsidian-works enters the battlefield tapped.
, , Sacrifice Obsidian-works: Put a -1/-1 counter on target creature.
, : Draw a card, then discard a card.
: Add 
or 
to your mana pool.), , Sacrifice Obsidian-works: Put a -1/-1 counter on target creature.
, : Draw a card, then discard a card.
