Anthousa, Setessan Hero
Legendary Creature — Human Warrior
Heroic — Whenever you cast a spell that targets Anthousa, Setessan Hero, up to three target lands you control each become 2/2 Warrior creatures until end of turn. They're still lands.
The warriors she leads can rarely keep pace with her, and neither can the tales.
Illustrated by
Theros#149RareEnglishLegality
Rulings
If a land that hasn’t been under your control continuously since your last turn began becomes a creature, it can’t attack and its activated abilities that include 
can’t be activated. Notably, it can’t be tapped for mana that turn.
Heroic abilities will resolve before the spell that caused them to trigger.
Heroic abilities will trigger only once per spell, even if that spell targets the creature with the heroic ability multiple times.
Heroic abilities won’t trigger when a copy of a spell is created on the stack or when a spell’s targets are changed to include a creature with a heroic ability.