The Joker card has no function or standing in the game Blackjack. However, in a home game, it could be used as the cut  card. That's a card that is slipped into the deck where one wishes to cut , or separate the cards without revealing the bottom card inadvertently.

Blackjack (formerly black jack and vingt-un) is a casino banking game. It is the most widely played casino banking game in the world. It uses decks of 52 cards and descends from a global family of casino banking games known as "twenty-one".

To encourage baby Toothless to hatch, rock his egg back and forth to hear him growl; tap to hear him tap back; and shake and tilt the egg to get him aggravated  once he's agitated enough, he'll be ready to hatch! Outside of his egg, Toothless is ready for fun and adventure.

Have a bucket ready, you may have to put out the fire before it spreads, and the dragon could be killed by the fire. By default eggs take 7200 ticks (6 minutes) to hatch, this can be changed in the mod's configs.