Master Duel, so whilst you can find some truly overpowered cards, it's recommended that you just open packs, explore each one you unlock, and go with what sounds interesting.
It also has the chance to be really weak, which is why it's last on this list
In Advanced format, everyone is talking about how Vampires aren't good, but I like them from a thematic perspective
Set 1 Call of the Haunted from your Deck or GY, and if you do, discard 1 card
Griggle
UR Ultra Rare Performapal Swincobra X EARTH Level 4 [ ReptilePendulumEffect ] ATK 300 DEF 1800 P Scale 2 Once per turn, when a monster you control inflicts battle damage to your opponent: You can send the top card of your opponent's Deck to the Graveyard