At the beginning of your draw step, Island Sanctuary causes you to skip your card draw, and prevent creatures without flying and/or islandwalk from attacking you.
Because Archetype of Imagination causes all creatures to lose flying, only creatures with islandwalk can attack you.

Only creatures with islandwalk can attack you

You do not draw cards during your draw steps

Island Sanctuary

Archetype of Imagination

At the beginning of your draw step, Island Sanctuary causes you to skip your card draw, and prevent creatures without flying and/or islandwalk from attacking you.
Because Mystic Decree causes all creatures to lose flying, only creatures with islandwalk can attack you.

No creature can attack you

Mystic Decree

Cast Ember Island Production by paying its mana cost, targeting a creature you control.
Holding priority, cast Dualcaster Mage by paying {1}{R}{R}.
When Dualcaster Mage enters the battlefield, it triggers, copying Ember Island Production, targeting Dualcaster Mage.
Resolve the copy of Ember Island Production, creating a token copy of Dualcaster Mage.
Repeat from step 3.

Infinite ETB

Infinite creature tokens

Infinite magecraft triggers

Dualcaster Mage

Ember Island Production

At the beginning of your end step, Jon Irenicus triggers, causing an opponent who controls no Islands to gain control of Island Fish Jasconius.
Island Fish Jasconius triggers, causing the opponent to sacrifice it.
However, Island Fish Jasconius cannot be sacrificed due to its ability granted by Jon Irenicus.
Island Fish Jasconius triggers again, creating a mandatory infinite loop that causes the game to end in a draw.

Draw the game

Jon Irenicus, Shattered One

Island Fish Jasconius

If needed, give control of Island Fish Jasconius to an opponent who controls no Islands.
When Island Fish Jasconius's controller controls no Islands, Island Fish Jasconius triggers, causing them to sacrifice it.
However, Island Fish Jasconius cannot be sacrificed due to Assault Suit.
Island Fish Jasconius triggers again, creating a mandatory infinite loop that causes the game to end in a draw.

Assault Suit

At the beginning of your draw step, Island Sanctuary causes you to skip your card draw, and prevents creatures without flying and/or islandwalk from attacking you.
Because Gravity Sphere causes all creatures to lose flying, only creatures with islandwalk can attack you.

Gravity Sphere

Cast Ember Island Production by paying its mana cost, targeting a creature you control.
Holding priority, cast Naru Meha either from your hand or from the command zone by paying {2}{U}{U} plus commander tax, if applicable.
When Naru Meha enters the battlefield, it triggers, copying Ember Island Production, targeting Naru Meha.
Resolve the copy of Ember Island Production, creating a token copy of Naru Meha.
Put either Naru Meha into your graveyard due to the legend rule.
Repeat from step 3.

Naru Meha, Master Wizard

Cast Ember Island Production by paying its mana cost, creating a token copy of Mirror-Mad Phantasm.
Activate the Mirror-Mad Phantasm token by paying {1}{U}, shuffling the token into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it.

Infinite self-mill

Mirror-Mad Phantasm

Cast Ember Island Production by paying its mana cost, targeting Biovisionary.
Holding priority, activate Echo Mage by tapping it, copying Ember Island Production twice, with both copies targeting Biovisionary.
Resolve all Ember Island Production spells, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary triggers. Resolve the first trigger, causing you to win the game.

Win the game

Biovisionary

Echo Mage

Activate Thunderclap Drake by paying {2}{U} and sacrificing it.
Cast Ember Island Production by paying its mana cost, targeting Biovisionary.
Thunderclap Drake triggers, copying Ember Island Production at least twice, with all copies targeting Biovisionary.
Resolve all Ember Island Production spells, creating at least three copies of Biovisionary.
At the beginning of your end step, each Biovisionary triggers, causing you to win the game.

Thunderclap Drake

Cast Mnemonic Deluge by paying {6}{U}{U}{U}, exiling Ember Island Production and casting three copies of it without paying their mana costs.
Resolve the three Ember Island Production copies, creating three token copies of Biovisionary.
At the beginning of your end step, each Biovisionary you control triggers.
Resolve the first trigger, causing you to win the game.

Mnemonic Deluge

At the beginning of your precombat main phase. Summon: G.F. Cerberus triggers, putting a lore counter on it and triggering its third chapter ability, copying the next instant or sorcery spell you cast twice.
Cast Ember Island Production by paying its mana cost, targeting Biovisionary.
Summon: G.F. Cerberus triggers, copying Ember Island Production twice, with the copies targeting Biovisionary.
Resolve all Ember Island Productions, copying Biovisionary three times.
At the beginning of your end step, each Biovisionary triggers. Resolve the first trigger, causing you to win the game.

Summon: G.F. Cerberus

Cast Ember Island Production by paying its mana cost, creating a token copy of Bellowing Aegisaur.
Activate a mana-producing permanent you control by tapping it, adding at least {G}.
Activate Wayta by paying {G} and tapping it, causing Cacophodon and the nontoken Bellowing Aegisaur to fight each other, with each only taking 1 damage due to Temple Altisaur.
Cacophodon and Bellowing Aegisaur each trigger twice.
Resolve all Bellowing Aegisaur triggers, putting two +1/+1 counters on each other creature you control.
Resolve both Cacophodon triggers, untapping the mana-producing permanent and Wayta.
Repeat from step 2, alternating between having the token and nontoken Bellowing Aegisaur fight Cacophodon.

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