Gjallarhorn

{10}, {t}: Search your library for up to five God creature cards and exile them. If Heimdall, Bifrost Guardian is on the battlefield under your control, you may search for up to ten God creature cards instead.
At the beginning of your end step you may cast a card exiled with Gjallarhorn without paying its mana cost. If you cast Ragnarok on this turn you may cast all cards exiled with Gjallarhorn without paying thei