Requires

Clock of Omens must be on the battlefield. Mycosynth Lattice must be on the battlefield. Shrieking Drake must be in hand. Grinding Station must be on the battlefield. You control a permanent that can tap to produce at least .

Steps

1. Activate a permanent you control by tapping it, adding at least .
2. Cast Shrieking Drake by paying .
3. Shrieking Drake enters the battlefield, triggering itself and Grinding Station.
4. Resolve the Grinding Station trigger, untapping it.
5. Activate Clock of Omens by tapping Grinding Station and Shrieking Drake, untapping the mana-producing permanent.
6. Resolve the Shrieking Drake trigger from step 3, returning itself from the battlefield to your hand.
7. Repeat.

Results