All Beast-Type monsters you control gain 100 ATK for each monster in your Graveyard. Field Spell Cards cannot be activated. Field Spell Cards cannot be activated during the turn this card is destroyed.
These monsters can help fill your Graveyard faster because they are easily destroyed by your opponent. Bubonic Vermin is able to sponge the damage by swarming to the field from your deck, while Nimble Musasabi is slightly tricky to use, as it must be Special Summoned to your opponent’s field from your Deck first, and you have to destroy it.
These are some of the Field Spells that are frequently played in current meta. Closed Forest is able to restrict these cards from being activated.
Be careful not to use cards like Bazoo the Soul Eater, although it is a strong Beast-type monster, but it requires banishing monsters from your Graveyard to increase its own attack, which in turn will weaken Closed Forest’s effect.
Similarly to other Field Spells, this card can be searched out faster by using Planet Pathfinder.
It counters the option to send Phoenix to graveyard in order to draw Yaksha. This move can't be activated. In situations you only have Phoenix and Fire King Island in your hand, be prepared for a brick.