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
• You have a nonartifact creature card in hand with mana value 4 or greater or with in its mana cost that can be cast using only one color of mana
• You control a nonartifact creature card with mana value 4 or greater or with in its mana cost that can be cast using only one color of mana
• Helga does not have summoning sickness
• Helga has a power that is equal to or greater than 4 or the highest mana value among the generic creatures, whichever is greater

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