As an example, there was a Fighting-type master in the TCG Game, who I managed to beat heavily simply by playing a Haunter Fossil Deck
Tarkir: Dragonstorm no longer had that restriction
Burst Return X SPELL If you control a face-up "Elemental HERO Burstinatrix": Return all face-up "Elemental HERO" monsters on the field to the hand, except "Elemental HERO Burstinatrix"
Legendary Creature Human Wizard
He can exile cards for +1 points and effectively put them in a side deck that's accessible as long as he's still in play
In a deck consisting of Lugia EX, Magby, and Zeraora (running on and Energies), you can retreat Magby for free, bring Lugia EX to the forefront, and use Juggler to transfer , , and (from Zeraora) to Lugia EX, and make it attack