Llanowar Tribe, Cloudstone Curio, Frog Tongue, and Instill Energy

Prerequisites

• Llanowar Tribe on the battlefield
• Cloudstone Curio on the battlefield
• Frog Tongue in hand or on the battlefield
• Instill Energy in hand
• available

Steps

1. Pay to cast Instill Energy targeting Llanowar Tribe
2. Cloudstone Curio triggers returning Frog Tongue to your hand if it's on the battlefield
3. Tap Llanowar Tribe, adding
4. Activate Instill Energy to untap Llanowar Tribe
5. Pay to cast Frog Tongue, targeting Llanowar Tribe and drawing a card
6. Cloudstone Curio triggers, returning Instill Energy to your hand

Results

• Infinite card draw
• Infinite green mana