Cast Man-o'-War without paying its mana cost.
Man-o'-War enters the battlefield, triggering to return itself to your hand.
Repeat.

Infinite ETB

Infinite LTB

Infinite storm count

Aluren

Man-o'-War

Cast Man-o'-War without paying its mana cost.
Man-o'-War enters the battlefield, targeting itself.
Molten Echoes triggers, creating a token copy of Man-o'-War.
Token copy of Man-o'-War enters the battlefield, returning original Man-o'-War to hand.
Resolve the original Man-o'-War triggers, fails to resolve due to having no legal targets.
Repeat.

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