I think this should help.
Original Leech Card wrote:
Arcane. Steals 2 Vitality from 1 target.
Updated 2.0 Version wrote:
Arcane. Attack. Focus. Attack 1 target within range. If this attack hits the target, restore 2 Vitality.
They're both Range 1 and Damage 2.
I think that clears up a couple things. It's a focus attack so any Focus items like the lucky cup will add dice to it and it's not an automatic success.