Sagu Wildling
{4}{G}Creature — Dragon
Flying
When this creature enters, you gain 3 life.

Creature — Dragon // Sorcery — Omen
Creature — Dragon
Flying
When this creature enters, you gain 3 life.
Sorcery — Omen
Search your library for a basic land card, reveal it, put it into your hand, then shuffle. (Also shuffle this card.)
This card's ability triggers when it enters the battlefield, not when it's cast. Effects that double ETB triggers (like Panharmonicon) work here. Countering the spell prevents the creature from entering, so the ETB won't fire.