Cast Glasspool Mimic by paying {0} due to Aluren, choosing to have it enter the battlefield as a copy of Mischievous Pup.
When Glasspool Mimic enters the battlefield, it triggers, returning Mischievous Pup from the battlefield to your hand.
Cast Mischievous Pup by paying {0} due to Aluren.
When Mischievous Pup enters the battlefield, it triggers, returning Glasspool Mimic from the battlefield to your hand.
Repeat.

Infinite ETB

Infinite LTB

Infinite storm count

Aluren

Mischievous Pup

Glasspool Mimic // Glasspool Shore

Cast Glasspool Mimic by paying its mana cost. Choose to have it enter the battlefield as a copy of Rakdos Joins Up.
Put Glasspool Mimic into your graveyard due to the legend rule.
Glasspool Mimic's first ability and second ability trigger, along with Rakdos Joins Up's second ability.
Resolve Glasspool Mimic's second trigger and Rakdos Joins Up's trigger, dealing damage to target opponent.
Resolve Glasspool Mimic's first trigger, returning it from your graveyard to the battlefield with two +1/+1 counters on it as a copy of Rakdos Joins Up.
Repeat from step 2.

Infinite death triggers

Infinite damage

Rakdos Joins Up

Opalescence

Activate Zur by paying {1}{W}, causing Rakdos Joins Up to become a creature.
Cast Glasspool Mimic by paying its mana cost. Choose to have it enter the battlefield as a copy of Rakdos Joins Up.
Put Glasspool Mimic into your graveyard due to the legend rule.
Glasspool Mimic's first ability and second ability trigger, along with Rakdos Joins Up's second ability.
Resolve Glasspool Mimic's second trigger and Rakdos Joins Up's trigger, dealing damage to target opponent and causing you to gain that much life.
Resolve Glasspool Mimic's first trigger, returning it from your graveyard to the battlefield with two +1/+1 counters on it as a copy of Rakdos Joins Up.
Repeat from step 3.

Infinite lifegain triggers

Infinite lifegain

Zur, Eternal Schemer

Starfield of Nyx

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