Activate the creature with Leyline Immersion attached by tapping it, adding {4}{G} that can only be spent to cast spells.
Cast Elvish Fury with buyback by paying {4}{G}, targeting Akroan Conscriptor.
Akroan Conscriptor triggers, causing you to untap the creature with Leyline Immersion attached.
Resolve Elvish Fury, giving Akroan Conscriptor +2/+2 until end of turn and returning Elvish Fury to your hand.
Repeat.

Infinitely large Akroan Conscriptor until end of turn

Infinite magecraft triggers

Infinite storm count

Akroan Conscriptor

Leyline Immersion

Elvish Fury

Activate the creature with Leyline Immersion attached by tapping it, adding {4}{R} that can only be spent to cast spells.
Cast Seething Anger with buyback by paying {3}{R}, targeting Akroan Conscriptor.
Akroan Conscriptor triggers, causing you to untap the creature with Leyline Immersion attached.
Resolve Seething Anger, giving Akroan Conscriptor +3/+0 until end of turn and returning Seething Anger to your hand.
Repeat.
Once you have infinite mana, you may target another creature with Seething Anger to get infinitely powerful creatures until end of turn, or you may use Akroan Conscriptor's ability to untap any other creature(s) you control.

Infinite colored mana that can only be spent to cast spells

Infinite mana creatures you control can produce

Infinite untap of creatures you control

Infinite power for creatures you control until end of turn

Seething Anger

Activate the creature with Leyline Immersion attached by tapping it, adding {3}{U}{U} that can only be spent to cast spells.
Cast Mind Games with buyback by paying {2}{U}{U}, targeting Akroan Conscriptor.
Akroan Conscriptor triggers, causing you to untap the creature with Leyline Immersion attached.
Resolve Mind Games, tapping Akroan Conscriptor and returning Mind Games to your hand.
Repeat.
Once you have infinite mana, you may use Akroan Conscriptor's ability to untap any other creature(s) you control.

Mind Games

Activate the creature with Leyline Immersion attached by tapping it, adding {4}{U} that can only be spent to cast spells.
Cast Whim of Volrath with buyback by paying {2}{U}, targeting Akroan Conscriptor.
Akroan Conscriptor triggers, causing you to untap the creature with Leyline Immersion attached.
Resolve Whim of Volrath, returning it to your hand.
Repeat.
Once you have infinite mana, you may use Akroan Conscriptor's ability to untap any other creature(s) you control.

Whim of Volrath

Activate the creature with Leyline Immersion attached by tapping it, adding {4}{U} that can only be spent to cast spells.
Cast Clockspinning with buyback by paying {3}{U}, targeting Akroan Conscriptor.
Akroan Conscriptor triggers, causing you to untap the creature with Leyline Immersion attached.
Resolve Clockspinning, returning it to your hand.
Repeat.
Once you have infinite mana, you may target another creature with Clockspinning to get infinite proliferate, or you may use Akroan Conscriptor's ability to untap any other creature(s) you control.

Combos with "Akroan Conscriptor"