Resources

Magic: The Gathering Oracle Changes

Planar Chaos to Future Sight (Single Change View)

Changes involving "cumulative upkeep"

Old card (Planar Chaos) New card (Future Sight)

Heart of Bogardan

{2}{R}{R}

Enchantment

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

When Heart of Bogardan's cumulative upkeep isn't paid, it deals damage equal to twice the number of age counters minus two to target player and each creature he or she controls.

Heart of Bogardan

{2}{R}{R}

Enchantment

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 Heart of Bogardan's cumulative upkeep isn't paid, it deals X damage to target player and each creature he or she controls, where X is twice the number of age counters on Heart of Bogardan minus two.