Helga, Skittish Seer, Mind Over Matter, and Cloudstone Curio

Prerequisites

• Helga, Skittish Seer on the battlefield
• Mind Over Matter on the battlefield
• Cloudstone Curio on the battlefield
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Steps

1. Activate Helga by tapping it, adding an amount of any one color of mana equal to its power that can only be spent to cast creature spells with mana value 4 or greater or creature spells with in their mana cost
2. Cast the creature with mana value 4 or greater or in its mana cost by paying its mana cost, ensuring to spend at least four total mana if needed
3. Helga triggers, causing you to draw a card, gain 1 life and put a +1/+1 counter on Helga
4. When the creature enters the battlefield, Cloudstone Curio triggers, returning the other creature with mana value 4 or greater or in its mana cost from the battlefield to your hand
5. Activate Mind Over Matter by discarding a card, untapping Helga
6. Repeat

Results

• Near-infinite mana permanents you control can produce
• Infinite self-discard triggers
• Near-infinite lifegain
• Near-infinite lifegain triggers
• Near-infinite ETB
• Infinite draw triggers
• Infinite looting
• Near-infinite storm count
• Near-infinite LTB
• Near-infinite untap of permanents you control
• 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