When you cast Enter the Unknown on a creature, that creature Explores 2
Wildgrowth Walker should trigger (+1/+1 and you gain 3 Life). It instead does nothing.
Likewise, when Jadelight Ranger explores, it explores the first time and triggers Wildgrowth Walker. It then explores a second time and does not trigger Wildgrowth Walker (it also gives mana to the opponent if there is a match but there’s already a thread for that).
//Edited Title -Brigby