Symmetry Matrix Combos
Nadir Kraken + Symmetry Matrix + Ashnod's Altar
Nadir Kraken + Symmetry Matrix + Mana Echoes
Symmetry Matrix + Myr Turbine + Mind over Matter
The Locust God + Symmetry Matrix + Ashnod's Altar
Combo result
Infinite card draw. Infinite draw triggers. Near-infinite creature tokens with haste. Near-infinite colorless mana. Near-infinite ETB. Near-infinite LTB. Near-infinite death triggers. Near-infinite sacrifice triggers.
Prerequisites
All permanents on the battlefield. You have a way to draw a card.