Murkrow (8/17) [POP Series 1] Darkness[×2] −5: Artifacts you control become

−5: Artifacts you control become artifact creatures with base power and toughness 5/5 until end of turn

If Mishra's War Machine deals damage to you this way

Set: Friday Night Magic 2010 Type: Creature — Elf Shaman Rarity: Rare Cost: {1}{G} When Elvish Visionary enters the battlefield

Set: Avacyn Restored Type: Enchantment Rarity: Rare Cost: {4}{B} Whenever an opponent loses life

Set: Portal Three Kingdoms Type: Creature — Wolf Rarity: Uncommon Cost: {2}{G} You may have Lone Wolf assign its combat damage as though it weren't blocked

Murkrow (8/17) [POP Series 1] Darkness[×2] −5: Artifacts you control becomeSet: POP Series 1 Type: Darkness Rarity: Uncommon Retreat cost: Colorless