If exactly 1 other Plant-Type monster you control (and no other cards) is destroyed by battle or by card effect and sent to the Graveyard: You can target 1 card your opponent controls; destroy that target. This card must be face-up on the field to activate and to resolve this effect.
Remove from play a Rose Lover in your graveyard to special summon this monster from your hand and make her immune to traps for this turn. Dust Knight makes this easier by sending Rose Lover from your deck to the graveyard.
Since many Naturia monsters are Plant-type, Mariña, Princess of Sunflowers could be a useful addition. Especially since Naturias have low stats meaning they are easily destroyed allowing you to use the effect of Mariña, Princess of Sunflowers multiple times.
Currently no. Just try to thin your deck fast so you have a hinger chance of getting her. I hope Chirubime come out soon during fall, then Tytannial in winter so I can get all of my signature cards in the game.
Talaya is spring, Marina is summer, next one will be autumn which is Chirubime