Thornhart, the Verdant

Daybound, nightbound
{t}, {g}: attach a creature you control to Thornhart, the Verdant. Put a +2/+2 counter on attached creature, and during your next untap step, detach the creature and heal life equal to its toughness.
During nighttime, Thornhart, the Verdant does not tap using its ability and can use it multiple times per turn.