Rootha, Mercurial Artist, Hellkite Courser, Ashnod's Altar, and Quasiduplicate

Prerequisites

• Rootha, Mercurial Artist on the battlefield
• Hellkite Courser on the battlefield
• Ashnod's Altar on the battlefield
• Quasiduplicate in hand
• available

Steps

1. Cast Quasiduplicate by paying , targeting Hellkite Courser
2. Holding priority, activate Rootha by paying and returning it to your hand, targeting Quasiduplicate
3. Choose to have Rootha returned to the command zone instead of your hand
4. Resolve the Rootha ability, copying Quasiduplicate, targeting Hellkite Courser
5. Resolve the copy of Quasiduplicate, creating a token copy of Hellkite Courser
6. Hellkite Courser enters the battlefield, putting Rootha from the command zone onto the battlefield
7. Activate Ashnod's Altar by sacrificing the Hellkite Courser token, adding
8. Repeat from step 2

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite sacrifice triggers