Activate Mutavault's second ability by paying {1}, causing it to become a 2/2 creature with all creature types until end of turn.
Activate Mutavault's first ability by tapping it, adding {C}.
Deeproot Pilgrimage triggers, creating a 1/1 Merfolk creature token.
When the Merfolk enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat from step 2.

Infinite colorless mana

Infinite creature tokens

Infinite ETB

Infinite mana creatures you control can produce

Infinite untap of creatures

Infinite untap of creatures you control

Mutavault

Deeproot Pilgrimage

Intruder Alarm

Activate Manascape Refractor using Mutavault's second ability by paying {1}, causing Manascape Refractor to become a 2/2 creature with all creature types until end of turn.
Activate Manascape Refractor using Griffin Canyon's second ability by tapping it, untapping Manascape Refractor and giving it +1/+1 until end of turn.
Repeat step 2.

Infinitely large creature until end of turn

Manascape Refractor

Griffin Canyon

Activate Mirran Safehouse using Mutavault's second ability by paying {1}, causing Mirran Safehouse to become a 2/2 creature with all creature types until end of turn.
Activate Mirran Safehouse using Griffin Canyon's second ability by tapping it, untapping Mirran Safehouse and giving it +1/+1 until end of turn.
Repeat step 2.

Mirran Safehouse

Activate Mutavault's first ability by tapping it, adding {C}.
Activate Mutavault's second ability by paying {1}, causing it to become a 2/2 creature that is still a land until end of turn.
Cast Exchange of Words by paying {1}{U}{U}, exchanging the text boxes of Mutavault and Scute Swarm.
Play a land.
The land enters the battlefield, triggering Mutavault's Scute Swarm ability, creating a copy of Mutavault with its original text.
Step 5 repeats in a mandatory loop unless interrupted, drawing the game.

Draw the game

Infinite landfall triggers

Infinite tapped creature tokens

Exchange of Words

Scute Swarm

Activate Mutavault's second ability by paying {0}, causing it to become a 2/2 creature with all creature types in addition to its other types until end of turn.
Activate Mutavault's second ability by paying {0}.
Crackdown Construct triggers, giving itself +1/+1 until end of turn.
Repeat from step 2.

Blossoming Tortoise

Crackdown Construct

Activate Mutavault's second ability by paying {0} due to Blossoming Tortoise, causing Mutavault to become a 2/2 creature with all creature types until end of turn.
Cast Draconic Destiny by paying {1}{R}{R}, attaching it to Mutavault.
Activate Mutavault by paying {0} due to Blossoming Tortoise, giving it +1/+0 until end of turn.
Repeat step 3.

Infinitely powerful creature until end of turn

Draconic Destiny

Activate Mutavault's second ability by paying {1}, causing it to become a 2/2 creature with all creature types in addition to its other types.
Cast Exchange of Words by paying {1}{U}{U}.
When Exchange of Words enters the battlefield, it triggers, exchanging the text boxes of Ley Weaver and Mutavault.
Activate Mutavault by tapping it, untapping itself and any other land you control.
Repeat step 4.

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