Riptide Laboratory Combos
Archmage of Echoes + Riptide Laboratory + Timestream Navigator
Dualcaster Mage + Riptide Laboratory + Turnabout
Reset + Dualcaster Mage + Riptide Laboratory
Timestream Navigator + Flameshadow Conjuring + Riptide Laboratory
Timestream Navigator + Molten Echoes + Riptide Laboratory
Timestream Navigator + Reflections of Littjara + Riptide Laboratory
Combo result
Infinite turns.
Prerequisites
Timestream Navigator in hand. All other permanents on the battlefield. You have the city's blessing and/or control at least eight permanents. "Human", "Pirate", or "Wizard" chosen with Reflections of Littjara. {U}{U} available the first turn, with {U}{U}{U} available each other turn.