Lethal Vapors [Scourge] Kithkin Knight if you control the artifact

if you control the artifact with the highest mana value or tied for the highest mana value

exorcists were always welcome in Scarwood

Avatar of Hope can block any number of creatures

Set: Mirage Type: Sorcery Rarity: Rare Cost: {3}{R}{R} Each player may bid life for control of target creature

and you may cast the copy without paying its mana cost

Lethal Vapors [Scourge] Kithkin Knight if you control the artifactSet: Scourge Type: Enchantment Rarity: Rare Cost: {2}{B}{B} Whenever a creature enters the battlefield, destroy it. {0}: Destroy Lethal Vapors. You skip your next turn. Any player may activate this ability. The vapors infiltrate every crevice, poison every lung, and snuff out every life.