Intimidating Mutant, Darkface

/:When placed, [discard a card from your hand], choose one of your opponent's rear-guards without any Cradle markers, and put a Cradle marker on it. /:When it attacks a vanguard, 1, choose one of your opponent's rear-guards with a Cradle marker on it, retire it, and this unit gets +5000 until end of that battle for each grade of the chosen unit.