If a Ravage caused by the Habsburg Mining Expedition (Level 1+) would add a Blight to a land with Blight and no Explorers/Towns, what happens if there are no pieces to Upgrade (e.g., because only Cities are participating in that Ravage)?
If a Ravage caused by the Habsburg Mining Expedition (Level 1+) would add a Blight to a land with Blight and no Explorers/Towns, what happens if there are no pieces to Upgrade (e.g., because only Cities are participating in that Ravage)?
Nothing — neither upgrade nor cascade.
Avarice Rewarded doesn't check if an upgrade is possible before it replaces the cascade.