Flying
Prince of Chaos — When Be'lakor enters, you draw X cards and you lose X life, where X is the number of Demons you control.
Lord of Torment — Whenever another Demon you control enters, it deals damage equal to its power to any target.
The number of Demons you control is counted only as Be'lakor, the Dark Master's ability resolves. If Be'lakor is still on the battlefield, it will count itself.