Titania, Nature's Force Combos
Titania, Nature's Force + Underworld Breach + Phyrexian Altar
Titania, Nature's Force + Underworld Breach + Thermopod
Combo result
Infinite self-mill. Near-infinite ETB. Near-infinite LTB. Near-infinite death triggers. Near-infinite sacrifice triggers. Near-infinite storm count.
Prerequisites
Flamekin Harbinger in your graveyard. All other permanents on the battlefield. You have at least three additional cards in your graveyard. {R} available.