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.
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.
|Monster/Spell/Trap categories||Destroys your opponent's Monster Cards / Destroys your opponent's Spell Cards / Destroys your opponent's Trap Cards|