Combo Possibility Storm +Lavinia, Azorius Renegade + Magic: the Gathering MTG

Lavinia, Azorius Renegade

's ability causes any card that was cast and no mana was paid for to be countered.

Possibility Storm

doesn't allow the card cast to resolve, as it will change into another random card that shares a type with it. Either the first card gets cast and the second card not cast, or the second card get's countered. That is, your opponent can hardly interact, because he cannot cast spells. This is a Soft Lock, because cards on the battlefield, un-counterable spells or effects that don't use the stack are unaffected by this combo (for exemple, cycling a card such as

Decree of Pain

).

Legallity