Chrystian, Titian's puppet

Whenever another non-token Eldrazi enters the battlefield under your control, target opponent sacrifices a permanent and taps a land they control
{p/c}{c} {t} Reveal three cards with "Kozilek", "Ulamog", and "Emrakul" in your hand. exile those cards, then during the next upkeep, target opponent chooses one of the exiled cards. that card comes into play under your control, and you shuffle this card and all non-legendary Eldrazi you control into your library