Necklace of Planeswalkers

Whenever Necklace of Planeswalkers enters the battlefield, each planeswalker you control gets 1 loyalty point
{2}, {t}: search your library for a planeswalker card and put it into your hand. Then shuffle your library
{7}, sacrifice Necklace of Planeswalkers and a creature: use target ability of a planeswalker you control without paying for it with loyalty points