Prototype Portal + Clock of Omens + Grinding Station + Darksteel Citadel

Prerequisites

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Steps

1. 1Activate Prototype Portal by paying and tapping it, creating a token copy of Darksteel Citadel.
2. 2The Darksteel Citadel token enters, triggering Grinding Station, untapping Grinding Station.
3. 3Activate Clock of Omens by tapping the Darksteel Citadel token and Grinding Station, untapping Prototype Portal.
4. 4Repeat.

Effects

• Infinite landfall triggers
• Infinite tapped land tokens