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Revealing that hed managed to steal one when hed gotten his hand inside the box

It's seriously scary stuff

But probably the most obvious examples are the Plague Rat and Benalish Hero decks

Notably, this means that you may discard a card to keep Argentum Masticore on the battlefield even if there isn't a legal target for that second triggered ability

Endboard: Diabell I:P Masquerena Rucia Woes Tales Notable GY: Silvy, Elzette, Astellar From here, on the opponent's turn, you have Diabells special summon effect (with cost ready to go from the set Tales) as an interaction while getting back Astellar and Elzette in the process