PLST: Gemstone Caverns meta-watchlist Whenever a black card is

Whenever a black card is put into an opponent's graveyard from anywhere

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At the beginning of combat on your turn

as each of your opponents can choose to follow each action you take by expending valuable resources

PLST: Gemstone Caverns meta-watchlist Whenever a black card isIf Gemstone Caverns is in your opening hand and you're not the starting player, you may begin the game with Gemstone Caverns on the battlefield with a luck counter on it. If you do, exile a card from your hand. {T}: Add {C}. If Gemstone Caverns has a luck counter on it, instead add one mana of any color.