Merciless Eradicator

When Merciless Eradicator enters the battlefield
or is turned face up, at the beginning of the next
end step, each opponent loses life equal to the
life that player lost this turn.
Mistmorph--{b}, Pay 4 life. (You may cast this
card face down as a 2/2 creature for {3}. You may
turn it face up for its mistmorph cost as long as it's attacking.)
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Survivors only prolong their misery.