Gotta agree there. It's a major stalemate, unless someone has a game breaking card or two.
20 cards...hmmmm, that's a lot of cards in hand..... maybe actually have a licrary? Say, 10 cards in hand and 10 in library and you have 10 draws during the game to use as you please in your draw step? You don't have to draw, but you can...still no hand limit.