Dark Leo & Shredder in hand or on the battlefield or in the command zone.
Easy Prerequisites
An opponent cannot block
Dark Leo & Shredder if it's on the battlefield, or another creature you control otherwise.
Dark Leo & Shredder doesn't have summoning sickness if it's on the battlefield.
You control at least four Ninjas.
Mana Needed
({W} magic symbol) ({B} magic symbol) plus commander tax if applicable if
Dark Leo & Shredder isn't on the battlefield available.
Steps
Declare
Dark Leo & Shredder as an attacker if it's on the battlefield, or another creature you control otherwise.
If
Dark Leo & Shredder isn't on the battlefield, when the declared creature is unblocked, cast
Dark Leo & Shredder either from your hand or from the command zone for its sneak cost by paying ({W} magic symbol) ({B} magic symbol) plus commander tax if applicable and returning the unblocked attacker to your hand.
Deal combat damage using
Dark Leo & Shredder, triggering its second ability, creating a 1/1 Ninja creature token and causing the opponent to lose half their life total, rounded up.
At the beginning of your end step,
Wound Reflection triggers, causing the opponent to lose the rest of their life total.
Notes
You must control four Ninjas when
Dark Leo & Shredder deals combat damage. Notably, if it isn't on the battlefield, you must control five total Ninjas if the attacker you will be returning is a Ninja.