Molten-Core Maestro, and Reiterate

Prerequisites

• Molten-Core Maestro on the battlefield
• Reiterate in hand
• at most plus enough mana to cast the additional instant or sorcery available

Steps

1. Cast the other instant or sorcery by paying its mana cost
2. Molten-Core Maestro triggers, putting a +1/+1 counter on it, and adding an amount of equal to its power if the spell had mana value 5 or greater
3. Holding priority, cast Reiterate with buyback by paying , targeting the instant or sorcery
4. Molten-Core Maestro triggers, putting a +1/+1 counter on it and adding an amount of equal to its power
5. Resolve Reiterate, copying the instant or sorcery and returning Reiterate to your hand
6. Repeat from step 3

Results

• Infinite +1/+1 counters on a creature
• Infinite copies of the casted instant or sorcery
• Infinite magecraft triggers
• Infinite red mana
• Infinite storm count