Tayam, Luminous Enigma, Mossborn Hydra, Lithatog, and Serra's Sanctum

Prerequisites

• Tayam, Luminous Enigma on the battlefield
• Mossborn Hydra on the battlefield
• Lithatog on the battlefield
• Serra's Sanctum on the battlefield

Steps

1. Activate Serra's Sanctum by tapping it, adding at least
2. Activate Lithatog by sacrificing Serra's Sanctum
3. Activate Tayam by paying and removing three counters from creatures you control, causing you to mill three cards and return Serra's Sanctum from your graveyard to the battlefield
4. When Serra's Sanctum enters, Mossborn Hydra triggers, doubling the number of +1/+1 counters on it
5. Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite landfall triggers
• Infinite self-mill
• Infinite white mana
• Infinitely large creature until end of turn