Infinite storm countInfinite combat phasesInfinite untap of creatures you controlInfinite mana creatures you control can produceInfinite magecraft triggersInfinite combat damage
How it works
Deal combat damage with the creature that has Spellbinder attached, triggering Spellbinder.
Holding priority, activate any number of creatures you control by tapping them, adding at least 2.
Resolve the Spellbinder trigger, casting a copy of Great Train Heist without paying its mana cost, and choosing to pay an additional 2 to select its first mode, causing you to untap all creatures you control and to get an additional combat phase after this one.