Spinerock Tyrant, and Croaking Counterpart

Prerequisites

• Spinerock Tyrant on the battlefield
• Croaking Counterpart in hand
• available

Steps

1. Cast Croaking Counterpart by paying its mana cost targeting the creature that can recur spells
2. When you cast that spell, Spinerock Tyrant triggers, copying Croaking Counterpart and choosing Spinerock Tyrant as its target
3. Resolve the copy of Croaking Counterpart, creating a Spinerock Tyrant token
4. Resolve the original Croaking Counterpart, creating a token copy of the spell recursion creature
5. When that token enters, it triggers, returning Croaking Counterpart from your graveyard to your hand
6. Repeat from step 1 one additional time, resulting in a total of five Spinerock Tyrants
7. Cast the spell that creates a Treasure token by paying its mana cost, targeting any creature
8. Each copy of Spinerock Tyrant triggers, copying that spell once for each Spinerock Tyrant you control
9. Resolve all copies of that spell, creating at least one Treasure token each time
10. Activate those Treasure tokens by tapping and sacrificing them, adding one mana per Treasure
11. Cast Croaking Counterpart by paying its mana cost targeting the spell recursion creature
12. When you cast that spell, each copy of Spinerock Tyrant triggers, copying Croaking Counterpart once for each Spinerock Tyrant and choosing the spell recursion creature once and Spinerock Tyrant as each additional spell's target
13. Resolve all copies of that spell, creating two copies of the spell recursion creature and additional copies of Spinerock Tyrant
14. When the first spell recursion creature token enters, it triggers, returning the spell that creates Treasure from your graveyard to your hand
15. When the second spell recursion creature token enters, it triggers, returning Croaking Counterpart from your graveyard to your hand
16. Repeat from step 7

Results

• Infinite ETB
• Infinite Treasure tokens
• Infinite colored mana
• Infinite copies of creatures you control
• Infinite magecraft triggers
• Infinite storm count