Marsh-Trap Shaman

When Marsh-Trap Shaman dies, entrap the
top card of your library. (Put that card onto
the battlefield face down as a 0/1 Mine artifact creature with defender and "When this creature would die, instead turn it face up and exile it. If
it is a nonland card, cast it without paying its
mana cost." Players may not look at the card
while it is face down.)