Thriving Grove [Ravnica: Clue Edition] Battle for Zendikar Promos Ferocious — You gain 4

Ferocious — You gain 4 life for each creature you control with power 4 or greater

if three or more cards were put into your graveyard from anywhere other than the battlefield this turn

This explains why the goblins remain unaffected

but now the people of Kamigawa have built high enough to reach them

Thriving Grove [Ravnica: Clue Edition] Battle for Zendikar Promos Ferocious — You gain 4Set: Ravnica: Clue Edition Type: Land Rarity: Common Thriving Grove enters the battlefield tapped. As Thriving Grove enters the battlefield, choose a color other than green. {T}: Add {G} or one mana of the chosen color. Far from human eyes, birds flit between vivid blossoms in a hidden paradise.