Kitsa, Otterball Elite + Great Train Heist

Kitsa, Otterball Elite

Great Train Heist

How it works

1. Cast Great Train Heist by paying at least 2, choosing its first mode and optionally its second and/or third modes.
2. Kitsa's prowess ability triggers, giving it +1/+1 until end of turn.
3. Holding priority, activate any number of creatures by tapping them, adding at least 2.
4. Activate Kitsa's second ability by paying 2 and tapping it, copying Great Train Heist.
5. Resolve the copy of Great Train Heist, untapping all creatures you control and causing you to get an additional combat phase after this one if it is your combat phase, along with any other mode(s) that were chosen.
6. Repeat from step 3.

This clever loop turns Great Train Heist into a self-sustaining engine by abusing its own spree-driven untap mode. As you cast Great Train Heist, Kitsa, Otterball Elite benefits from prowess, pumping its power to the required 3 or greater so its second ability can come online. With enough mana-producing creatures tapped to feed the copy cost, Kitsa copies the spell over and over, allowing the resolution of each copy to untap your entire board and generate extra combat phases.