When Urza's war machines became too costly, Tawnos's weaponry replaced them.

Masters Edition IV

Tawnos's Weaponry

You may choose not to untap Tawnos's Weaponry during your untap step.
{2}, {T}: Target creature gets +1/+1 for as long as Tawnos's Weaponry remains tapped.

When war machines became too costly, Tawnos's weaponry replaced them.

Fifth Edition

You may choose not to untap Tawnos's Weaponry during your untap phase.
o2, oc
T: Target creature gets +1/+1 as long as Tawnos's Weaponry remains tapped.

Renaissance

Rinascimento

Fourth Edition Foreign Black Border

When war machines became too costly, Tawnos's Weaponry replaced them.

Fourth Edition

o2, oc
T: Target creature gets +1/+1 as long as Tawnos's Weaponry remains tapped.
You may choose not to untap Tawnos's Weaponry during your untap phase.

Antiquities

o2: Target creature gains +1/+1 as long as Tawnos's Weaponry remains tapped. You may choose not to untap Tawnos's Weaponry during untap phase.