Accessing the grave is very important to an infernity deck, if you can take that away then you have a huge advantage because it'll shut down Infernity Avenger and Infernity Necromancer. Use banishing effects like Macro Cosmos, Dimensional Fissure, and D.D. Crow. Also if they cant empty their hand you'll pretty much have the duel won.
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He plays an infernity deck. Go on yugioh wikia and search infernity
The Exodia strategy can be strong if the right cards are drawn. However, this type of Deck relies heavily on Draw Power and Deck Thinners. If at any point you are able to Remove from Play an Exodia piece, you are most likely guaranteed a victory as your opponent will more than likely not have a card in their Deck that can retrieve the Removed from Play Exodia piece.
grass is his only weakness
the dragunity deck is a structure deck
Ground is electrics only weakness.