Tayam, Luminous Enigma + Mossborn Hydra + Serra's Sanctum + Need for Speed
Tayam, Luminous Enigma
Mossborn Hydra
Serra's Sanctum
Need for Speed
Infinite +1/+1 counters on a creatureInfinite landfall triggersInfinite self-millInfinite white mana
How it works
Activate Serra's Sanctum by tapping it, adding at least 3.
Activate Need for Speed 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.