Cast Sakashima's Protege by paying {4}{U}{U}.
Sakashima's Protege enters as a copy of Sharuum.
Put Sharuum into the graveyard due to the legend rule.
Sakashima's Protege triggers, returning Sharuum from your graveyard to the battlefield.
Put Sharuum into the graveyard due to the legend rule.
Sharuum enters the battlefield triggers, returning itself from your graveyard to the battlefield.
Repeat from step 5.

Infinite death triggers

Infinite ETB

Infinite LTB

Sharuum the Hegemon

Sakashima's Protege

Activate Walking Ballista by removing a +1/+1 counter from it, dealing 1 damage to itself.
Rite of Passage and Sakashima's Protege trigger, putting two +1/+1 counters on Walking Ballista.
Repeat an arbitrarily large number of times.
Move to the next turn, removing all damage marked on Walking Ballista.
Activate Walking Ballista by removing a +1/+1 counter from it, dealing 1 damage to any target.
Repeat step 5 as desired.

Infinite damage

Infinite +1/+1 counters

Rite of Passage

Walking Ballista

During your upkeep, Stasis, Trade Caravan and Sakashima's Protege trigger.
Activate a basic Island by tapping it, adding {U}.
Resolve the Stasis trigger, causing you to pay {U}.
Resolve the Trade Caravan and Sakashima's Protege triggers, putting a currency counter on each of them.
During an opponent's upkeep, activate either Trade Caravan or Sakashima's Protege by removing two currency counters from it, untapping a basic Island.
Repeat.

Players skip their untap steps

Trade Caravan

Stasis

Cast Myth Unbound by paying {2}{G}.
Cast Sakashima's Protege by paying {4}{U}{U}, choosing to have it enter the battlefield as a copy of Myth Unbound.
Activate Phyrexian Altar by sacrificing Tamiyo, adding {U}.
Choose to return Tamiyo to the command zone from your graveyard.
Myth Unbound and Sakashima's Protege trigger, causing you to draw two cards.
Cast Tamiyo from the command zone by paying {U}.
Repeat from step 3.

Infinite card draw

Near-infinite ETB

Infinite draw triggers

Near-infinite storm count

Near-infinite LTB

Near-infinite death triggers

Near-infinite sacrifice triggers

Near-infinite commander casts

Tamiyo, Inquisitive Student // Tamiyo, Seasoned Scholar

Myth Unbound

Phyrexian Altar

Cast Myth Unbound by paying {2}{G}.
Cast Sakashima's Protege by paying {4}{U}{U}, choosing to have it enter the battlefield as a copy of Myth Unbound.
Activate Thermopod by sacrificing Rograkh, adding {R}.
Choose to have Rograkh return to the command zone from your graveyard.
Both copies of Myth Unbound trigger, causing you to draw two cards.
Resolve the ability from step 1.
Cast Rograkh from the command zone by paying {0} due to the cost reductions from both copies of Myth Unbound.
Repeat from step 3.

Near-infinite red mana

Rograkh, Son of Rohgahh

Thermopod

Combos with "Sakashima's Protege"