Dr. Jennifer Keller

Vigilance Whenever Dr. Jennifer Keller or another creature you control is dealt damage, you may prevent 1 damage and investigate. {1}, Sacrifice a Clue: Choose one — -Target creature gains indestructible until end of turn. -Return target creature card with mana value 3 or less from your graveyard to your hand. -You gain 3 life. Whenever you gain life, put a +1/+1 counter on another target creature you control.