Activate Helga by tapping it, adding at least eight {U} that can only be spent to cast creature spell with mana value 4 or greater or with {X} in their mana cost.
Cast Hoverguard Sweepers by paying its mana cost.
Helga and Chakram Retriever trigger.
Resolve the Helga trigger, causing you to draw a card, gain 1 life, and put a +1/+1 counter on Helga.
Resolve the Chakram Retriever trigger, causing you to untap Helga.
When Hoverguard Sweepers enters the battlefield, it triggers, returning it and up to one other creature from the battlefield to their owner's hand.
Repeat.

Infinite card draw

Near-infinite lifegain

Near-infinite lifegain triggers

Near-infinite ETB

Infinite draw triggers

Near-infinite storm count

Near-infinite LTB

Near-infinite +1/+1 counters on Helga

Near-infinite colored mana that can only be spent to cast creature spells with mana value 4 or greater or creature spells with X in their mana cost

Return a portion of target creatures to their owner's hand

Helga, Skittish Seer

Chakram Retriever

Hoverguard Sweepers

Activate Helga by tapping it, adding at least eight {U} that can only be spent to cast creature spells with mana value 4 or greater or creature spells with {X} in their mana cost.
Cast Hoverguard Sweepers by paying {6}{U}{U}.
Helga triggers, causing you to draw a card, gain 1 life and put a +1/+1 counter on Helga.
When Hoverguard Sweepers enters the battlefield, it triggers, returning itself from the battlefield to your hand.
Activate Mind Over Matter by discarding a card, untapping Helga.
Repeat.

Near-infinite mana permanents you control can produce

Infinite self-discard triggers

Infinite looting

Near-infinite untap of permanents you control

Mind Over Matter

Activate Sneak Attack by paying {R}, putting Priest of Urabrask from your hand onto the battlefield.
Priest of Urabrask enters the battlefield, adding {R}{R}{R}.
Activate Sneak Attack by paying {R}, putting Hoverguard Sweepers from your hand onto the battlefield.
Hoverguard Sweepers enters the battlefield, returning itself and Priest of Urabrask from the battlefield to your hand.
Repeat.

Infinite ETB

Infinite LTB

Infinite red mana

Return any number of creatures to their owners' hands

Sneak Attack

Priest of Urabrask

Cast Hoverguard Sweepers by paying {0}.
When Hoverguard Sweepers enters, it triggers, returning itself from the battlefield to your hand.
Repeat.

Infinite storm count

Morophon, the Boundless

Leyline of Mutation

Cast Hoverguard Sweepers by tapping a number of creatures and paying {0}.
When Hoverguard Sweepers enters the battlefield, it and Intruder Alarm trigger.
Resolve the Hoverguard Sweepers trigger, returning it from the battlefield to your hand.
Resolve the Intruder Alarm trigger, untapping all creatures.
Repeat.

Infinite mana creatures you control can produce

Infinite untap of all creatures

Dazzling Theater // Prop Room

Intruder Alarm

Activate Sneak Attack by paying {R}, putting Ardent Electromancer from your hand onto the battlefield.
When Ardent Electromancer enters the battlefield, it triggers, adding at least {R}{R}.
Activate Sneak Attack by paying {R}, putting Hoverguard Sweepers from your hand onto the battlefield.
When Hoverguard Sweepers enters the battlefield, it triggers, returning it and Ardent Electromancer from the battlefield to your hand.
Repeat.
If you control at least three creatures in your party when Ardent Electromancer enters the battlefield, this combo nets infinite {R}.

Ardent Electromancer

Cast Nethroi either from your hand or from the command zone for its mutate cost by paying {4}{G/W}{B}{B}, putting it under a non-Human creature you control.
Nethroi triggers, returning Hoverguard Sweepers and Mitotic Slime from your graveyard to the battlefield.
When Hoverguard Sweepers enters, it triggers, returning Nethroi from the battlefield to your hand.
Activate Phyrexian Altar twice by sacrificing Hoverguard Sweepers and Mitotic Slime, adding {B}{B}.
When Mitotic Slime dies, it triggers, creating two 2/2 Ooze creature tokens.
Activate Phyrexian Altar twice by sacrificing the Oozes, adding {1}{G/W}.
When the Oozes die, they trigger, creating four 1/1 Ooze creature tokens.
Activate Phyrexian Altar three times by sacrificing three Oozes, adding {3}.
Repeat.

Combos with "Hoverguard Sweepers"