Yenna, Redtooth Regent, Second Wind, and Auratog

Prerequisites

• Yenna, Redtooth Regent on the battlefield
• Second Wind on the battlefield
• Auratog on the battlefield
• You control a creature that can tap to produce at least
• Yenna does not have summoning sickness

Steps

1. Activate the mana-producing creature by tapping it, adding at least
2. Activate Yenna by paying and tapping it, creating a token copy of Second Wind attached to the mana-producing creature, then untapping Yenna and causing you to scry 2
3. Activate the Second Wind token's second ability by tapping it, untapping the mana-producing creature
4. Activate Auratog by sacrificing the Second Wind token, causing Auratog to get +2/+2 until end of turn
5. Repeat

Results

• Infinitely large Auratog until end of turn
• Infinite scry 2