Kain is a good early play that can guarantee you the top-ups you need, and you can do some dastardly things with him, like building him tall and strapping a Vampiric Link to him to ensure you gain life off of anyone attacking with him
Buster Blader, for example, has invulnerability to Dragon class monsters and Exodia The Forbidden One can't be hit by any monster attacks save for those that have either the Flying or Tunneling ability
Lower numbers are generally more exciting, but if you open the biggest number in a run (like a 500/500), thats usually worth more than a middling number, too
Misty's Staryu #90Common $1.67 Misty's Staryu #92Common $1.75 Misty's Staryu #46Common $0.12 Misty's Staryu #23Common $0.11 Staryu #65Common $0.71 Staryu #65Common $1.71 Staryu #95Common $0.52 Staryu #56Common $0.64 Staryu #20Common $0.15 Staryu #75Common $0.38 Kangaskhan #47Rare $0.24 Gyarados GX #16Ultra Rare $5.52 Jynx #30Uncommon $0.12 Ekans (26) #26Common $0.21 Onix GX #36Ultra Rare $3.09 Blaine's Last Stand #52Rare $0.22 Golem #35Rare $0.31 Mr
GR Gold Rare Graff, Malebranche of the Burning Abyss X DARK Level 3 [ FiendEffect ] ATK 1000 DEF 1500 If you control a monster that is not a "Burning Abyss" monster, destroy this card
Some of them are as likely to put a blade in you as greet you, so it may be best to heed my advice