Haru, Hidden Talent, Dryad Arbor, Thaumatog, and Rukarumel, Biologist

Prerequisites

• Haru, Hidden Talent on the battlefield
• Dryad Arbor in hand
• Thaumatog on the battlefield
• Rukarumel, Biologist on the battlefield

Steps

1. Play Dryad Arbor
2. When Dryad Arbor enters as an Ally due to Rukarumel, Haru triggers, earthbending Dryad Arbor
3. Activate Dryad Arbor by tapping it, adding
4. Activate Thaumatog by sacrificing Dryad Arbor
5. When Dryad Abor dies, Haru triggers, returning Dryad Arbor from your graveyard to the battlefield
6. When Dryad Arbor enters as an Ally due to Rukarumel, Haru triggers, earthbending Dryad Arbor
7. Resolve the Thaumatog ability
8. Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite landfall triggers
• Infinitely large Thaumatog until end of turn
• Infinite green mana