Witch Engine
ef749290-58e2-4b40-a141-5fe294f9b995
$1.00 CND
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
{T}: Add {B}{B}{B}{B} to your mana pool. Target opponent gains control of Witch Engine. (Activate this ability only any time you could cast an instant.)