I have been using a grabbix with a bit of control: 1 chaos seed, 1 lighting, 1 shockwave
Deck was something like: 5 photon, 5 immo, 5 phoenix, 5 graboid, 1 arsenic, 1 chaos seed, 1 lighting, 1 shockwave, 1 forest spirit, 1 stiletto, 4 nova.
That one had a winrate of exactly 80%, but I didn't get a single rare spin in 25 games (4 wins, 1 loss every time), but, something along these line has a good chance to work.