From the Shadows

Each player reveals their hand. Target player
discards their hand, then draws seven cards.
Until end of turn, you may cast creature cards
from that players graveyard, and you may spend
mana as though it were mana of any color to cast
it. You lose twice X life, where X is the number
of cards discarded this way.
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The shadows of the underworld corrupt your being.
You are but a mere puppet.