Planeloyal Eidolon

As Planeloyal Eidolon enters the battlefield, choose a planeswalker you control. Planeloyal Eidolon's power and toughness are equal to the number of loyalty counters on that planeswalker.
Whenever you put one or more loyalty counters on a planeswalker, Planeloyal Eidolon gets +X+0 until end of turn, where X is the number of loyalty counters on that planeswalker.