Greiger wields both a ground deck and a turbo deck. Both of Greiger's decks are Reactor decks. These decks wield Monster Reactor SK, Trap Reactor Y FI, and Spell Reactor RE, which can combine for form Flying Fortess SKY FIRE. However when Greiger became a Dark Signer, his turbo deck was simliar, but had a few differences. An excample is having the Dark Synchro monster; Dark Flattop, and his strongest monster; Earthbound Immortal Chacu Challhua.