Lilo Oklo, Feared By Hell

: Whenever a creature enters the battlefield under your control, you gain life equal to its toughness.
+4: This ability can only be used if your devotion to green and white is more than or equal to 10. You gain 7 life.
-X: Until end of turn, creatures you control with lifelink get +X/+X and gain "Whenever you gain life, you gain double the amount of life."