Some common good luck charms or sayings for poker include:

1
"Aces full, beat that" - this is a phrase used when you have a full house made up of aces and another card.
2
"Rabbit's foot" - a rabbit's foot is considered lucky and is often carried by players as a good luck charm.
Father in Heaven, we ask your blessing on the game we are about to play. Give each one of us the courage to play this game in a manner which by our words and our actions is pleasing to you. Let us enter into this competition in a spirit of sportsmanship and with a respect for the members of the opposing team.