Digimon
This series involves the main cast of characters falling into a digital World
Digimon
It's time to duel when the case of this series battles it out using a deck of cards
Yu-Gi-Oh!
In this, a classic example of a Isekai series, the main character Genki is transported into his favorite video game after winning a tournament of it in the real world
Monster Rancher
A literal Gacha (Capsule) Machine kicks off this series which involves the main character having to figure out the cause of the problems caused by the creatures in this anime
Yo-Kai Watch
This series involves a young boy named Ikki and his robot named Metabee as they fight others to become a champion of The World Robattle Tournament
Metabee