All 28 Combos with Echoes of Eternity

Ulalek, Fused Atrocity + Glaring Fleshraker + Echoes of Eternity

Infinite Damage: Infinite LTB, Infinite ETB, Infinite sacrifice triggers, Infinite death triggers, Infinite damage, Infinite creature tokens, Infinite copies of abilities you control on the stack, Infinite copies of a specific creature

Cast any colorless Eldrazi spell by paying its mana cost, triggering Ulalek twice, Echoes of Eternity twice and Glaring Fleshraker's first ability twice. Resolve a Ulalek trigger, causing you to pay {C}{C} to copy the colorless spell, the remaining Ulalek trigger, both Echoes of Eternity triggers and both Glaring Fleshraker triggers. Resolve the first Glaring Fleshraker trigger, creating a 0/1 Eldrazi Spawn creature token. When the Eldrazi Spawn enters the battlefield, Glaring Fleshraker's second ability triggers, dealing 1 damage to each opponent. Activate the Eldrazi Spawn by sacrificing it, adding {C}. Repeat from step 3 one additional time. Repeat from step 2.