Yenna, Redtooth Regent + Airtight Alibi + Careful Cultivation + Phantatog

Prerequisites

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Steps

1. 1Activate Yenna by paying and tapping it, creating a copy of Airtight Alibi attached to Yenna, and then untapping Yenna and causing you to scry 2.
2. 2When the Airtight Alibi token enters, it triggers. Holding priority, activate Yenna by tapping it, adding .
3. 3Resolve the Airtight Alibi trigger, untapping Yenna.
4. 4Activate Phantatog by sacrificing the Airtight Alibi token.
5. 5Repeat.

Effects

• Infinite lifegain
• Infinite lifegain triggers
• Infinite scry
• Infinitely large creature until end of turn