Change the Game: Catan

Whenever a player plays a land, if they have the most lands, give them the Longest Road card.
Whenever a player plays a creature, if they have the most creatures, give them the Biggest Army card.
Whenever a player gains control of either the "Longest Road" or "Biggest Army" card, they gain two life.
Whenever a player loses control of either the "Longest Road" or "Biggest Army" card, they lose two life.