Taigam, Master Oppurtunist, Clockspinning, and Karn's Temporal Sundering

Prerequisites

• Taigam, Master Oppurtunist on the battlefield
• Clockspinning in hand
• Karn's Temporal Sundering in hand
• the first turn with each other turn available

Steps

1. Cast Karn's Temporal Sundering by paying its mana cost
2. Taigam triggers, copying Karn's Temporal Sundering and exiling the original Karn's Temporal Sundering with four time counters on it
3. Resolve the Karn's Temporal Sundering copy, causing you to take an extra turn after this one
4. Cast Clockspinning with buyback by paying , removing a time counter from Karn's Temporal Sundering and returning Clockspinning to your hand
5. Repeat step 4 one additional time
6. Move to your next turn
7. At the beginning of your upkeep, Karn's Temporal Sundering's suspend ability triggers, removing a time counter from it
8. Cast Clockspinning with buyback by paying , removing a time counter from Karn's Temporal Sundering and returning Clockspinning to your hand
9. Karn's Temporal Sundering's suspend ability triggers, causing you to cast it from exile without paying its mana cost
10. Repeat from step 2

Results

• Infinite turns