Umbris, Fear Manifest Combos
Umbris, Fear Manifest + Opposition Agent + Hive Mind
Umbris, Fear Manifest + Ruthless Technomancer + Phyrexian Metamorph
Combo result
Infinite Treasure tokens. Infinite colored mana. Infinite ETB. Infinite LTB. Infinite death triggers. Infinite sacrifice triggers. Exile each opponent's library.
Prerequisites
Ruthless Technomancer in hand. All other permanents on the battlefield. Opponents have at least six cards in exile. {B} available.