Cast Appa by paying {W}{W}
When Appa enters, its first ability triggers, exiling Felidar Guardian with the ability to cast it later from exile.
Cast Felidar Guardian from exile by paying {0}.
Appa's second ability triggers, creating a 1/1 Ally creature token
When Felidar Guardian enters, it triggers, blinking Appa.
Repeat from step 2.

Infinite creature ETB

Infinite creature LTB

Infinite storm count

Infinite creature tokens

Appa, Steadfast Guardian

Felidar Guardian

Thornscape Familiar

Stormscape Familiar

Cast Squee from your graveyard or from exile by paying {R}{R}.
Iraxxa triggers, creating a 2/2 Alien Warrior creature token.
Activate Thermopod's second ability twice by sacrificing Squee and the Alien Warrior, adding {R}{R}.
Repeat.

Infinite creature sacrifice triggers

Infinite death triggers

Iraxxa, Empress of Mars

Squee, the Immortal

Thermopod

Cast Kor Skyfisher by paying {0} and 2 life due to Defiler of Faith and Thornscape Familiar.
Defiler of Faith triggers, creating a 1/1 Soldier creature token.
When the Soldier enters, Liliana the Faultless triggers, causing you to gain life.
Resolve Kor Skyfisher. When it enters, it and Liliana the Faultless trigger.
Resolve the Kor Skyfisher trigger, returning it from the battlefield to your hand.
Resolve the Liliana the Faultless trigger, causing you to gain life.
Repeat.

Infinite lifegain triggers

Defiler of Faith

Kor Skyfisher

Liliana the Faultless

Activate Kiki-Jiki by tapping it, copying Blazing Firesinger. It'll enter prepared due to its effect.
Cast a copy of Seething Song by paying {1}{R} due to Thornscape Familiar.
Hematite Talisman triggers, causing you to pay {3} to untap Kiki-Jiki.
Resolve Seething Song, adding {R}{R}{R}{R}{R}.
Repeat.

Infinite creature tokens with haste

Infinite magecraft triggers

Kiki-Jiki, Mirror Breaker

Blazing Firesinger // Seething Song

Hematite Talisman

Cast Whitemane Lion by paying {W}.
Spider-Man India triggers, putting a +1/+1 counter on Crystalline Crawler.
When Whitemane Lion enters, it triggers, returning itself from the battlefield to your hand.
Activate Crystalline Crawler by removing a +1/+1 counter from it, adding {W}.
Repeat.

Spider-Man India

Crystalline Crawler

Whitemane Lion

Activate Thermopod by sacrificing Squee and Skyfire Phoenix, adding {R}{R}.
Cast Squee from your graveyard by paying {R}{R}.
Skyfire Phoenix triggers, returning it from your graveyard to the battlefield.
Repeat.

Skyfire Phoenix

Cast Squee from your graveyard or from exile by paying {R}{R}.
Iraxxa triggers, creating a 2/2 Alien Warrior creature token.
Activate Phyrexian Altar twice by sacrificing Squee and the Alien Warrior, adding {R}{R}.
Repeat.

Phyrexian Altar

Cast a copy of Seething Song from exile by paying no more than {1}{R}, adding {R}{R}{R}{R}{R}.
Activate Emiel the Blessed by paying {3}, blinking Blazing Firesinger, which enters prepared.
Repeat.

Combos with "Thornscape Familiar"