Argentum Masticore triggering with no cards in hand
Opponent had Argentum Masticore in play with Perennial Behemoth in play. Opponent had no cards in hand at the start of turn (but did have 1 land in graveyard). During upkeep, opponent was not able to discard a card with no cards in hand, but did not have to sacrifice Argentum Masticore. Instead, the game allowed him to destroy a token of mine (CMC 0 non/land permanents). My guess is the game allowed him to treat the land in his graveyard as though it was in hand because of the Perennial Behemoth.
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Halvar#34277 commented
Here is an example I win the game by sideboarding Jace from wish and win, but cannot select the wish card after playing it. To go and play him