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'Prototype {1}{B}{B} — 3/3 (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.) Menace, lifelink Ward—Pay life equal to this creature's...
'{B}: Regenerate this creature.
'When this creature enters, you draw a card and you lose 1 life.
'Flying
{T}, Sacrifice this creature: Target creature gets -2/-2 until end of turn.
'When this creature enters, return target creature card from your graveyard to the battlefield. You lose life equal to that card's mana value.
'When this creature enters, you draw a card and you lose 1 life.
'{2}{U}{U}: Exchange control of this creature and target creature. (This effect lasts indefinitely.)
'Sacrifice a creature: Add one mana of any color.
{1}{B}, Pay 2 life: Return target creature card from your graveyard to your hand.
'{T}, Sacrifice this creature: Target creature gets -4/-4 until end of turn.
Sacrifice a creature: Target creature gets -1/-1 until end of turn.
'When this creature enters, return target creature card from your graveyard to the battlefield. You lose life equal to that card's mana value.
'When this creature enters, you draw a card and you lose 1 life.