Helga, Skittish Seer, Chakram Retriever, and Hoverguard Sweepers

Prerequisites

• Helga, Skittish Seer on the battlefield
• Chakram Retriever on the battlefield
• Hoverguard Sweepers in hand
• Helga has power 8 or greater and does not have summoning sickness

Steps

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

Results

• 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