Behind the Mask is a common Instant card from Magic: The Gathering (Murders at Karlov Manor, MKM). Current market price: $0.08.
Common
Murders at Karlov Manor (MKM)
{U}
Mana Value
1
Colors
U
Card Text
As an additional cost to cast this spell, you may collect evidence 6. (Exile cards with total mana value 6 or greater from your graveyard.)
Until end of turn, target artifact or creature becomes an artifact creature with base power and toughness 4/3. If evidence was collected, it has base power and toughness 1/1 until end of turn instead.
