Bloodthirst

Bloodthirst is a keyword ability attributed to the Gruul guild of the Guildpact set from the Ravnica block. It works by putting a number of +1/+1 counters on a permanent (so far only creatures) as it comes into play, if an opponent has been dealt damage that turn.

From the ()

Rulings

• Bloodthirst checks for any kind of damage, including combat damage.
• Life loss that isn't caused by damage (for example, the life loss caused by Blood Seeker's ability) doesn't cause a creature with bloodthirst to get counters, but damage from a source with infect (a mechanic from the Scars of Mirrodin block) does, even though it doesn't cause loss of life.
• It doesn't matter who controlled the source of the damage dealt to your opponent. If an opponent was dealt damage by a source he or she controlled (such as Manabarbs, for example), creatures with bloodthirst that enter the battlefield under your control later that turn will get +1/+1 counters.
• The creature with bloodthirst enters the battlefield with the +1/+1 counters already on it. For example, a 1/1 creature that enters the battlefield with two +1/+1 counters on it will enter as a 3/3 creature, not as a 1/1 creature that then becomes 3/3.
• "Bloodthirst X" doesn't appear on any Magic 2012 cards.

Color percentages

• Red = 27 %
• Green = 45 %
• Multicolor = 27 %