CardName: Elwynn Peasant
Cost: G
Type: Creature - Human Worker
Pow/Tgh: 1/1
Rules Text: {T}: Add {1} to your mana pool. Spend this mana only on
Human spells.
Flavour Text:
Set/Rarity: [Duel Deck] Orcs vs. Humans Common
Elwynn Peasant
C
Creature – Human Worker
: Add to your mana pool. Spend this mana only on Human spells.
How about using the "Serf" type instead?
"Worker" is already a creature type I introduced for another design.
"Serf" would serve equally well if I decided not to use custom creature types.