Blade of the Bloodchief

Mana cost: {1}
Type: Artifact — Equipment
Set: Zendikar #196 (rare)
Price: $8.52 USD

Whenever a creature dies, put a +1/+1 counter on equipped creature. If equipped creature is a Vampire, put two +1/+1 counters on it instead.
Equip {1}

Blade of the Bloodchief has 4 printings, first in Zendikar (2009). EDHREC ranks it #2,479 among Commander cards. It appears most in Edgar Markov decks (16,037 on EDHREC). 2 public decks on TCG run it. It has 6 official rulings.

Legality

commander: legal
legacy: legal
vintage: legal
pauper: not legal
modern: legal
pioneer: not legal
standard: not legal
brawl: not legal

Public decks that run Blade of the Bloodchief

Blood Rites - The Lost Caverns of Ixalan Commander, led by Clavileño, First of the Blessed
Vampiric Bloodlust - Commander 2017, led by Edgar Markov

Commanders that run Blade of the Bloodchief most

Deck counts from EDHREC.

Edgar Markov: 16,037 decks
Clavileño, First of the Blessed: 5,798 decks
Evereth, Viceroy of Plunder: 5,112 decks
Elenda, the Dusk Rose: 4,893 decks
Carmen, Cruel Skymarcher: 1,870 decks
Olivia Voldaren: 1,394 decks
Strefan, Maurer Progenitor: 1,067 decks
Massacre Girl: 1,014 decks

Often played with Blade of the Bloodchief

Cards that show up in the same decks on EDHREC.

Rulings

2009-10-01: The +1/+1 counters are put on the equipped creature, not Blade of the Bloodchief. If Blade of the Bloodchief is moved to a different creature, the +1/+1 counters will stay where they are.
2009-10-01: The creature that gets the counters is the one that's equipped by Blade of the Bloodchief at the time the ability resolves. It doesn't matter what creature Blade of the Bloodchief was attached to (if any) when it triggered.
2009-10-01: If the equipped creature itself is put into a graveyard, Blade of the Bloodchief's ability will trigger. However, it won't do anything when it resolves unless a spell or ability has caused it to become attached to another creature by that time. (Remember that you may activate an equip ability only as a sorcery.)
2009-10-01: If the equipped creature and another creature are dealt lethal damage at the same time, the equipped creature will be put into a graveyard before it would receive any counters.
2009-10-01: Blade of the Bloodchief's ability triggers regardless of who controlled the creature and whose graveyard it was put into.
2009-10-01: If Blade of the Bloodchief leaves the battlefield before its triggered ability resolves, the counters are put on the creature it was attached to at the time it left the battlefield. If it wasn't attached to a creature at that time, nothing gets the counters.