(Sunken Fields isn't a spell.)
Sunken Fields enters the battlefield tapped unless you control two or more creatures.
, : Tap target artifact with converted mana cost X or less.
: Add or to your mana pool. Sunken Fields deals 2 damage to you.
, 
: Tap target artifact with converted mana cost X or less.: Add 
or 
to your mana pool. Sunken Fields deals 2 damage to you.
