Behind the Mask (MKM)

Instant

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.

Niche combat trick for blue tempo and artifact-focused strategies. Behind the Mask offers flexibility as either a modest pump spell or a way to temporarily neutralize a threat, but the evidence mechanic requires graveyard setup that most blue decks don't naturally generate, and the effect is easily outclassed by more efficient removal or evasion at the same cost.

Murders at Karlov Manor — Common