Darien, King of Kjeldor Combos
Darien, King of Kjeldor + Terror of the Peaks + Platinum Emperion
Darien, King of Kjeldor + Sanguinary Priest + Flowstone Surge
Darien, King of Kjeldor + Sanguinary Priest + Heartless Summoning
Darien, King of Kjeldor + Sanguinary Priest + Kaervek, the Spiteful
Darien, King of Kjeldor + Sanguinary Priest + Night of Souls' Betrayal
Darien, King of Kjeldor + Sanguinary Priest + Phyrexian Altar
Darien, King of Kjeldor + Sanguinary Priest + Sulfur Elemental
Darien, King of Kjeldor + Sanguinary Priest + Vampirism
Combo result
Infinite ETB. Infinite LTB. Infinite death triggers. Infinite lifegain triggers.
Prerequisites
All permanents on the battlefield. You control an additional creature. You have a way to cause the additional creature to die. Vampirism attached to any creature you control, except the aforementioned additional creature.