Miirym, Sentinel Wyrm + Realm-Scorcher Hellkite + Temur Sabertooth + Panharmonicon

Miirym, Sentinel Wyrm

Realm-Scorcher Hellkite

Temur Sabertooth

Panharmonicon

How it works

1. Cast Realm-Scorcher Hellkite by paying 4 and sacrificing another artifact, enchantment or token.
2. When Realm-Scorcher Hellkite enters the battlefield, it and Miirym trigger twice.
3. Resolve both Realm-Scorcher Hellkite triggers, adding 5.
4. Resolve both Miirym triggers, creating two token copies of Realm-Scorcher Hellkite.
5. Activate Temur Sabertooth by paying 1, returning Realm-Scorcher Hellkite to your hand from the battlefield.
6. Repeat.

This fiery loop relies on doubling up enter-the-battlefield triggers to generate a massive surplus of mana and fiery power. As you cast Realm-Scorcher Hellkite with its bargain cost paid, Panharmonicon ensures its mana-producing ability triggers twice, while Miirym, Sentinel Wyrm steps in to multiply the Dragon into nonlegendary token copies. You can then use Temur Sabertooth's active ability to bounce the original Realm-Scorcher Hellkite back to your hand, leaving you with more than enough mana left over to replay it and do it all over again.