Urtet, Remnant of Memnarch + Hellkite Charger + Cryptolith Rite

Urtet, Remnant of Memnarch

Hellkite Charger

Cryptolith Rite

How it works

1. At the beginning of your combat phase, Urtet triggers, untapping each Myr you control.
2. Declare Hellkite Charger as an attacker, triggering its ability.
3. Holding priority, activate seven Myr by tapping them, adding 5.
4. Resolve the Hellkite Charger trigger, causing you to pay 5 to untap all attacking creatures you control, and to get an additional combat phase after this one.
5. Repeat each combat phase.