Zyrgul, Factory in the Sky

Ward — Creatures you control lose flying until
end of turn.
When Zyrgul, Factory in the Sky enters the
battlefield and at the beginning of your upkeep,
create a 1/1 colorless Thopter artifact creature
token with flying.
Tap another untapped artifact you control: Add
{c}. Spend this mana only to cast colorless and
artifact spells.