I wouldnt run this treefolk druid in every green deck, but Id almost consider running green lifegain just to have a reason to use this card
Rooms are a mechanic in a subset I call "two-in-one cards." These are cards that represent two cards but exist on a single card, although possibly on both faces
Heres a screenshot from the game
The game uses a matchmaking system that analyses a players win ratio and the relative strength of a deck to find an opponent of relative strength
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When this card is Fusion Summoned it is treated as a Spell card and placed in the Spell/Trap Zone activating this effect: Send cards from the top of your Opponent's Deck to the graveyard equal to the number of monster materials used to summon this card, then take effect damage equal to the number of cards sent x300