Great options include equipment like Lightning Greaves and Swiftfoot Boots, along with counterspells like Swan Song, Force of Negation, Counterspell and even Mana Drain
When combined with zero-cost artifacts and cards that untap lands such as the two cards on this list that do that simply upon being cast it was rather trivial to produce massive amounts of mana to fuel a huge Stroke of Genius aimed at your opponent, winning you the game on the spot
Since Urborg, Tomb of Yawgmoth makes all lands into Swamps, so long as someone at the table has a copy in play, you can recur Bubbling Muck and untap lands as often as your cards will allow before casting a spell like Exsanguinate or Torment of Hailfire to win
This gets around hexproof and shroud
Cloudpost is basically an upgraded version of Tron that is easier to assemble (you don't need three different lands to get the benefit) and can make even more mana (three Cloudposts make nine mana, while Tron makes seven), with the drawback being that the lands come into play tapped