Cephalid Illusionist [Torment] BT9-083 SR {T}: Vein Drinker deals damage

{T}: Vein Drinker deals damage equal to its power to target creature

They likely refer not to one mage

Whenever two or more creatures attack

Set: March of the Machine Commander Type: Creature — Angel Rarity: Rare Cost: {3}{W} Flying

then mill cards equal to the number of eon counters on it

Cephalid Illusionist [Torment] BT9-083 SR {T}: Vein Drinker deals damageSet: Torment Type: Creature Cephalid Wizard Rarity: Uncommon Cost: {1}{U} Whenever Cephalid Illusionist becomes the target of a spell or ability, mill three cards. {2}{U}, {T}: Prevent all combat damage that would be dealt to and dealt by target creature you control this turn.