Manually searching for every card would take forever
While the Dragon's infamous field-clearing effect has still been retained on the updated version, and continues to inflict 300 damage to the opponent per card sent to the Graveyard, since 2018 this ability has come with a restriction
For example, you will need to have the monsters you want to tribute on the field of play, rather than being in your hand as with Fusion and Ritual Summoning
Because of this the card is difficult to deal with for some decks
If you have enough Rat tokens on the battlefield and a board wipe happens, it's possible that Mirkwood Bats can burn all of your opponents out of the game
To this day, this is still the most common measure that Konami has for controlling the Yu-Gi-Oh meta, and some of the game's most powerful cards remain banned