Magar of the Magic Strings, Rise of the Eldrazi, and Hardened Academic

Prerequisites

• Magar of the Magic Strings on the battlefield
• Rise of the Eldrazi in hand
• Hardened Academic on the battlefield
• available

Steps

1. Activate Hardened Academic by discarding Rise of the Eldrazi
2. Activate Magar by paying , noting Rise of the Eldrazi and putting it face down on the battlefield as a 3/3 creature
3. During your next turn, deal combat damage to an opponent using the 3/3 creature that has Rise of the Eldrazi noted
4. The creature triggers, casting a copy of Rise of the Eldrazi without paying its mana cost
5. Resolve the Rise of the Eldrazi copy, causing you to take an extra turn after this one
6. Repeat from step 3 during each turn
7. Cast Rise of the Eldrazi by paying its mana cost, causing you to take an extra turn after this one
8. Activate Magar by paying , noting Rise of the Eldrazi and putting it face down as a 3/3 creature
9. Move to your next turn
10. Deal combat damage to an opponent with the face down creature
11. The face down creature triggers, causing you to cast a copy of Rise of the Eldrazi without paying its mana cost
12. Resolve the copy of Rise of the Eldrazi, causing you to take an extra turn after this one
13. Repeat from step 3

Results

• Infinite turns
• Lock