I felt like coming up with a fan spec, with Lum at the head.
Lum – Neutral Luck Hero
Level 1-3: 2/3; Resist 1
Level 4-6: 2/4; Gain 1 gold.
Level 7: 3/5; Max Level: Draw a card.
Roll the Dice (2 cost)
Reveal the top card of your deck, then discard it. Give a unit or hero +X ATK/+X armor this turn, where X is that card’s cost (limit 6) (reveal and discard before choosing a target)
Mulligan (1 cost)
Discard your hand, then draw that many cards.
Crapshoot (3 cost)
Choose two units. If you do, choose one of them at random and destroy it. If it was a tech 2 or 3 unit, its controller gains 1 gold.
Jackpot (6 cost)
Reveal the top 3 cards of your deck. You may play any number of them for free. For each card you don’t play, gain 1 gold, then discard it.
(You still must meet any other requirements to play the cards.)
Generous Patron (2 cost)
Arrives: each player draws a card
Unfortunate Sucker (2 cost)
Arrives: an opponent discards a card at random. Trash a card from your hand.
Card Shark (3 cost)
Whenever you draw a card, Card Shark gets +1 ATK/+1 armor this turn.
Cheating Scoundrel (3 cost)
Arrives: Steal 1 from an opponent, then look at their hand.
Dice Golem (6 cost)
Attacks: Reveal the top card of your deck, then discard it. Deal X damage to a unit, where X is that card’s cost (limit 6) (reveal and discard before choosing a target)
Stacked Deck (2 cost Upgrade)
Upkeep: You may put a card from your discard pile on top of your deck.
Casino (4 cost Building)
1 gold Draw a card.
Golden Panda (7 cost)
Whenever an enemy unit or hero dies, gain 2 gold.
7 gold Play the top card of your deck for free. You don’t need to meet any requirements for it.