Some of them are as likely to put a blade in you as greet you, so it may be best to heed my advice
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
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
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
Entreat the Angels, Starnheim Unleashed, Finale of Glory, and Decree of Justice all reward you handsomely for spending a lot of mana on them