Synergies:
Sundial of the Infinite + Mimic Vat = tokens that stay on the battlefield.
Sundial of the Infinite + Glimmerpoint Stag = permanent exile.
Sundial of the Infinite + Mimic Vat + Glimmerpoint Stag = permanent exile and a 3/3 vigilant and haste creature that stays on the battlefield.
Sundial of the Infinite + Venser, the Sojourner + Oblivion Ring = repeating permanent exile.
Why these work:
It's all about the timing of activating Sundial of the Infinite.
Both Mimic Vat and Glimmerpoint Stag have delayed triggered abilities which trigger once and only once. Thus, you allow the delayed triggered abilities to go on the stack during the end step, then activate Sundial of the Infinite to exile those abilities and they will never trigger again. This means that for Mimic Vat, the tokens will stay on the battlefield indefinitely. As for Glimmerpoint Stag, the permanent will stay in exile for the rest of the game.
The Vensor/O-Ring combo is slightly different. After casting Oblivion Ring, you allow it to resolve and enter the battlefield, exiling a permanent. Then, during your second main phase, you exile it with Venser, the Sojourner. Then Oblivion Ring's second triggered ability will go on the stack and you activate Sundial of the Infinite in response, exiling the ability so the permanent is exiled for the rest of the game. Now, since the end step never occurred, Oblivion Ring will return to the battlefield at the next end step, which will be your opponent's. Rinse and repeat.
