Yenna, Redtooth Regent + Instill Energy + Thaumatog

Prerequisites

• You control a creature that can tap to produce at least .
• Yenna does not have summoning sickness.

Steps

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

Effects

• Infinite scry
• Infinitely large creature until end of turn