However its adviced to check with the judges
Wick has one of these abilities built in, letting you pay one blue, black, and red mana along side sacrificing a Snail to have Wick deal damage equal to that Snail to each opponent, while you draw cards equal to that value
But from the outside, seeing players with enormous decks of cards, built over several years of collecting, along with trying to follow the rules of the game, can force players to shy away from picking up a few booster packs or starter decks
It is still a steal effect at the usual cost, gives deathtouch and the assassin creature type does have some relevance with cards like Etrata Dealy Fugitive and Ramses Assassin Lord
Ghastly Demise generally only gets better as the game progresses, as the number of cards in your graveyard will only grow