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

Infinite ETB

Infinite LTB

Infinite storm count

Infinite creature tokens

Appa, Steadfast Guardian

Restoration Angel

Pearl Medallion

Grand Arbiter Augustin IV

Activate an animated land by tapping it, adding at least {U}.
Cast View from Above by paying {U}, targeting the animated land.
Orvar triggers, creating a token copy of the animated land that is not a creature.
Resolve View from Above, returning it to your hand.
Activate the land token by tapping it, adding at least {U}.
Repeat from step 2.

Infinite magecraft triggers

Infinite landfall triggers

Infinite tapped Island tokens

Card That Animates a Land

Orvar, the All-Form

View from Above

Cast Whitemane Lion by paying {0} and 2 life due to Defiler of Faith and Grand Arbiter Augustin IV.
Defiler of Faith triggers, creating a 1/1 Soldier creature token.
When the Soldier enters, Soul Warden triggers, causing you to gain life.
Resolve Whitemane Lion. When it enters, it and Soul Warden trigger.
Resolve the Whitemane Lion trigger, returning it from the battlefield to your hand.
Resolve the Soul Warden trigger, causing you to gain life.
Repeat.

Infinite lifegain triggers

Defiler of Faith

Soul Warden

Whitemane Lion

Activate Gwenna by tapping it, adding {U}{U} that can only be spent to cast creature spells or activate abilities of creatures.
Cast Aethersnipe for its evoke cost by paying {U}{U}.
Gwenna triggers, putting a +1/+1 counter on it and untapping it.
When Aethersnipe enters the battlefield, its first ability and evoke ability trigger.
Resolve the first Aethersnipe trigger, returning it from the battlefield to your hand.
Resolve the second Aethersnipe trigger, failing to sacrifice it as it is no longer on the battlefield.
Repeat.

Infinite +1/+1 counters on a creature

Aethersnipe

Gwenna, Eyes of Gaea

Cast Banishing Knack by paying {U}, targeting a creature you control that doesn't have summoning sickness.
Cast Corridor Monitor by paying {U} due to Grand Arbiter Augustin IV.
When Corridor Monitor enters, it triggers, untapping the creature targeted by Banishing Knack.
Activate Urza's first ability by tapping Corridor Monitor, adding {U}.
Activate the creature targeted by Banishing Knack by tapping it, returning Corridor Monitor from the battlefield to your hand.
Repeat from step 2.

Urza, Lord High Artificer

Corridor Monitor

Banishing Knack

Cast Retraction Helix by paying {U}, targeting a creature you control that doesn't have summoning sickness.
Cast Corridor Monitor by paying {U} due to Grand Arbiter Augustin IV.
When Corridor Monitor enters, it triggers, untapping the creature targeted by Retraction Helix.
Activate Urza's first ability by tapping Corridor Monitor, adding {U}.
Activate the creature targeted by Retraction Helix by tapping it, returning Corridor Monitor from the battlefield to your hand.
Repeat from step 2.

Retraction Helix

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

Activate Ashnod's Altar by sacrificing Wretched Throng, adding {C}{C}.
When Wretched Throng dies, it and Pitiless Plunderer trigger.
Holding priority, activate Sundering Archaic by paying {2}, putting Wretched Throng from your graveyard onto the bottom of your library.
Resolve the Pitiless Plunderer trigger, creating a Treasure token.
Resolve the Wretched Throng trigger, putting Wretched Throng from your library into your hand.
Activate the Treasure by tapping and sacrificing it, adding {U}.
Cast Wretched Throng by paying {U} due to Grand Arbiter Augustin IV.
Repeat.

Combos with "Grand Arbiter Augustin IV"