Unit — Mech Airship • Cost: 1 • ATK: 3 • HP: 4
Flying, Fading 2 (Arrives with two time runes. Remove one each upkeep. When you remove the last, sacrifice this.)
Discard a card → Add a time rune to this.
Purple • Past Tech II
You can't discard a card DURING your upkeep to save it from dying from fading. You can only use abilities during your own main phase unless they are specifically marked otherwise, such as "upkeep" abilities. — Sirlin, 03/19/16