Chairman of the Board

Game Shift: If the Chairman is using the Deck, he puts it away and sits in the Throne that erects itself underneath him. If the Chairman is on the Throne, it must crumble and all Pieces become inanimate before he can take out the Deck. A shift takes a full turn.

Scepter Hammer: The Chairman makes an attack with the King's Scepter with a +12 to hit. If it hits, target takes 3d8 bludgeoning damage and must make a DC 18 Con saving throw or be stunned.

Command: Each Piece within 30 ft. of the Chairman immediately take a move action int the direction of a target within the same range.

Royal Decree: The Chairman denotes a Piece within touch distance and turns it into a Queen. All pieces on the board crumble when the Queen appears, and there can only be one Queen on the battlefield.
Queen: The Queen Piece is a stone construct. She has an AC of 20, 120 HP, and can move as far as she'd like in any one direction. She can make an attack with her Scepter which has a +12 to hit. If hit, the target takes 5d10 damage and is stunned.

Pick a Card: The Chairman fans out his deck and sends a card to a target within 100ft. The card has a +8 to hit. If it hits, it deals 4d4 piercing damage and the traget makes a DC 16 CON save. If failed, the target takes an extra 4d4 damage of the Chairman's current damage type. 

52 Pickup: The Chairman launches a full deck's worth of cards in a cone centering on him and spreading up to 60 ft. All creatures within that range must make a DC 18 DEX save or take 104 piercing damage. All creatures who saved take only 52. 

Ace in the Hole: The Chairman takes an unseen Ace of Spades from his hat and launches it at a target within 20 ft. It is a guaranteed hit, but deals no damage. Instead every turn the affected must make a steadily increasing DC(10-20) Con save. If the target fails five of these saves, the target instantly dies and is sealed inside the card until released by the Chairman.

A Role of the Dice. As a reaction, the Chairman can use this ability to make a player re-roll any number of dice the Chairman chooses. The player must take the lower number.

Move the Pawn: With the snap of his fingers, the Chairman can move a creature up to 20 feet in a given cardinal direction. 

Spin the Roulette: When the Chairman needs, he can switch his damage type from Radiant to Necrotic and vice-versa.

The Chairman has 10 Legendary action points, regaining 3 on each of his turns.

The Chairman must be on a grid style of terrain for any of the following actions to work. Cannot use these actions if the Chairman is using his Deck.

Summon Pawn(1): The Pawn adheres to classic chess ruling for movement only. 
The Pawn is a stone construct creature with 30HP, an AC of 15, and a movement of 15 ft. The Pawn can make a sword attack at a +10 to hit. If it lands, the target takes 1d10 slashing damage.

Summon Knight(2): The Knight adheres to classic chess rules for movement only.
The Knight is a stone construct creature with 50HP, an AC of 17, and a movement of 25 ft. The Knight can make a spear attack at a +10 to hit. If it lands, the target takes 2d10 piercing damage.

Summon Bishop(2): The Bishop adheres to classic chess rules for movement only.
The Bishop is a stone construct creature with 40HP, an AC of 15, and a movement of 20 ft. The Bishop can cast the spell Cure Wounds up to level 5 once per turn.

Summon Rook(3): The Rook adheres to classic chess rules for movement only.
The Rook is a stone construct creature with 50HP, an AC of 18, and a movement of 30ft. The Rook can make a flail attack at a +10 to hit. If it lands, the target takes 3d10 bludgeoning damage.

The Chairman must have access to a full deck for the following to work. Cannot be used if the Chairman is using his Chess Set.

Shuffle the Deck: A target within touch range changes position with a random target within 60ft.

Deal: A target within 30ft must make a wisdom saving throw of DC 18. If the target fails, up to two points of a stat of the Chairman's choosing are trapped into the cards temporarily. 

Double Joker: A last resort attack that destroys the Chairman's deck. On activation, summon two Joker Card Golems. 
Red Card Joker: Can move up to 50ft, has an AC of 20, and 100HP. Attacks are made at a +12 to hit and deal 4d12 Radiant damage. 
Black Card Joker: Can move up to 50ft, has an AC of 20, and 100HP. Attacks are made at a +12 to hit and deal 4d12 Necrotic damage.

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