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She provides an enter the battlefield ability for any black creature under your control where you gain a life and each opponent loses a life

each of these cards lets you find a card from your library and put it on top of the deck to be drawn next

If it's a land card, you may put it into the battlefield tapped

Plenty of cards from that set offer benefits based on the number of party members or even having a full party with one of each creature type

Gemstone Caverns is a wild land, which if it's in your opening hand, and youre not the starting player, you can just start the game with it in play and with a luck counter on it