Urtet, Remnant of Memnarch + Hellkite Charger + Cryptolith Rite Combo

All permanents on the battlefield.

You control at least seven Myr without summoning sickness. An opponent cannot block and kill Hellkite Charger.

At the beginning of your combat phase, Urtet triggers, untapping each Myr you control.

Declare Hellkite Charger as an attacker, triggering its ability.

Holding priority, activate seven Myr by tapping them, adding .

Resolve the Hellkite Charger trigger, causing you to pay to untap all attacking creatures you control, and to get an additional combat phase after this one.

Repeat each combat phase.

Infinite combat phases

Infinite untap of Myr you control