This creature doesn't untap during your untap step.
Whenever another creature enters, untap this creature.
: Tap target creature with mana value 3 or less.
Illustrated by Mark Zug · Legions · #22
There are no rulings for Sunstrike Legionnaire.
Whenever you gain life, untap this creature.
When this creature enters, return target artifact card with mana value 1 or less from your graveyard to your hand.
When this creature enters, tap target creature an opponent controls. That creature doesn't untap during its controller's next untap step.
Whenever another creature you control with power 2 or less enters, you may pay . If you do, draw a card.
Whenever another creature you control with power 2 or less enters, target creature you control gets +1/+1 until end of turn.