Infinite +1/+1 counters on a creatureInfinite landfall triggersInfinite lifegainInfinite lifegain triggersInfinite self-millInfinite white mana
How it works
Activate Serra's Sanctum by tapping it, adding at least 3.
Activate Zuran Orb by sacrificing Serra's Sanctum.
Activate Tayam by paying 3 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.
When Serra's Sanctum enters, Mossborn Hydra triggers, doubling the number of +1/+1 counters on it.