Marsh Tzygnet

Endemic (If a Swamp enters the battlefield under
your control and this card is in your hand, you may
put it onto the battlefield tapped. If you do, you lose
life equal to its converted mana cost.)
Whenever a creature dies, you may scry 1.
"Somehow, swampwater is miserly. Rather than
brushed along by limpid currents, debris and detritus
are greedily sucked down into the eternal muck."