Deathly Wail (Yellow)

Rune Gate (If you control Runechants equal to or greater than Deathly Wail's cost, you may play it from your banished zone without paying its cost.)
When the combat chain closes, create Runechant tokens equal to the number of heroes who have lost this turn.
Blood Debt (While this is in your banished zone, at the beginning of your end phase, lose 1.)