Eunectes, Pythia Chieftan

When Eunectes, Pythia Chieftan enters the battlefield, search your library for an artifact
with mana value less than or equal to the greatest
mana value of artifacts you control, reveal it, put
it into your hand, then shuffle.
Sacrifice 5 non-token artifacts: Create The Big
Ugly Thing, a legendary 7/9 colorless Vehicle
artifact token with "Crew 3" and "Whenever this
creature blocks, return target artifact from your
graveyard to your hand."