Blood Echoes Channeling

Equip Hunter {0}. Whenever the enchanted Hunter kills a creature, put a Blood Echo counter on Blood Echoes Channeling equal to that creature’s cost. The enchanted Hunter gets +1/+1 for every level of Blood Echoes Channeling. Its level increases at the following thresholds: 1, 3, 6, 10, 15, 21... then increasing by its current level each time. If the enchanted Hunter dies, Blood Echoes Channeling loses all levels but keeps any remaining counters that did not complete a level.