Whenever Obsidian Watchtower becomes tapped, it deals 1 damage to you.
: Add or to your mana pool.
: Add to your mana pool. Put Obsidian Watchtower on top of your library.
, : Target Knight gets +1/+1 until end of turn.
: Add 
or 
to your mana pool.: Add 
to your mana pool. Put Obsidian Watchtower on top of your library., : Target Knight gets +1/+1 until end of turn.
