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'When this creature dies, each player discards their hand.
'Whenever this creature attacks, defending player mills half their library, rounded up. Unearth {1}{U}{U}{U} ({1}{U}{U}{U}: Return this card from your graveyard to the battlefield. It gains haste. Exile it at...
'When this creature dies, each player discards their hand.
'Whenever an opponent loses life, that player mills that many cards. (Damage causes loss of life.)
'When this creature dies, each player discards their hand.
'Soulbond (You may pair this creature with another unpaired creature when either enters. They remain paired for as long as you control both of them.) As long as Imperious Mindbreaker...
'Whenever an opponent loses life, that player mills that many cards. (Damage causes loss of life.)
'Whenever an opponent loses life, that player mills that many cards. (Damage causes loss of life.)
'Flying
When this creature enters, each opponent mills ten cards.
'When this creature dies, each player discards their hand.
'When this creature dies, each player discards their hand.
'Flying
{2}: Target player mills a card. This creature gets +X/+X until end of turn, where X is the milled card's mana value.