Guac & Marshmallow Pizza, Devoted Druid, and Banishing Knack

Prerequisites

• Guac & Marshmallow Pizza in hand
• Devoted Druid on the battlefield
• Banishing Knack in hand
• available

Steps

1. Cast Banishing Knack by paying , targeting Devoted Druid
2. Activate Devoted Druid's first ability by tapping it, adding
3. Cast Guac & Marshmallow Pizza by paying
4. When Guac & Marshmallow Pizza enters, it triggers, giving Devoted Druid +2/+2 until end of turn and untapping it
5. Activate Devoted Druid using the ability granted to it by Banishing Knack by tapping it, returning Guac & Marshmallow Pizza from the battlefield to your hand
6. Activate Devoted Druid's second ability by putting a -1/-1 counter on it, untapping it
7. Repeat from step 2

Results

• Infinite green mana
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control
• Infinitely large creatures you control until end of turn