Plague Lord

Plague Lord
UnitHorrorCost: 6ATK: 4 HP: 7
Arrives or attacks: Put a -1/-1 rune on each opposing unit and hero.
Upkeep: Each player's base takes 1 damage for each -1/-1 rune on their units and heroes.
Resist 2
BlackDisease Tech III

Card-Specific Rulings
The upkeep ability only triggers during your upkeep, not each other player's. When it triggers, even your own base takes damage if you have any -1/-1 runes on your units or heroes. — Sirlin
Resist X Rulings
This has nothing to do with attacking. Opponents don't have to pay to attack something with resist, they only have to pay to target it with spells or abilities. — Sirlin
This does stack, so if one of your units gets resist 1 twice, opponents must pay 2 gold to target it with spells or abilities. — Sirlin