In the card game, there are three main types of cards that make up the 60-card deck: Monster Cards, Spell Cards and Trap Cards
The "Venom" monster part is really limited if you do not want to work with "Venom" counters, so aside from three copies of "Venom Cobra" to summon via "Rescue Rabbit", three copies of "Vennominon the King of Poisonous Snakes" as a recurring monster and potential beatstick and one copy of "Vennominaga the Deity of Poisonous Snakes" as the card with the alternate win condition, there is not that much that I would deem playable in the monster department
With an easy way to grab a Supporter (Scott, Castaway) and assuming you will not have your hand thrown out by next turn, this can be a fantastic recovery card that adds plus 40 damage to your attack when behind on prizes
The transformed Sephiroth is a 5/5 Avatar Nightmare Angel with Flying, and whenever he attacks, you can sacrifice any number of creatures and draw that many cards
The few that do are usually pretty expensive and the quality may not be up-to-par in order to keep their production costs down