Resources

Magic: The Gathering Comprehensive Rules Changes

Ravnica: City of Guilds to Guildpact (Single Change View)

General changes

Old rule (Ravnica: City of Guilds) New rule (Guildpact)

502.50b.

"Bloodthirst X" is a special form of bloodthirst. "Bloodthirst X" means "This permanent comes into play with X +1/+1 counters on it, where X is the total damage your opponents have been dealt this turn."