Chronojet Dragon

:[Discard one or more cards with the sum of their grades being 3 or greater from your hand], search your deck for up to one grade 4 card, ride it as , and shuffle your deck. At the end of the turn, retire that unit, and ride a grade 3 card from your soul as . /:When it attacks, 1, and until end of that battle, this unit gets +5000, and your opponent cannot call sentinels from his or her hand.