Heart of Bogardan

Cumulative upkeep [2] (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)

When a player doesn't pay Heart of Bogardan's cumulative upkeep, Heart of Bogardan deals X damage to target player and each creature he/she controls, where X is twice the number of age counters on Heart of Bogardan minus 2.