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
Six mana for a 6/6 with flying and trample sounds like a great deal in Standard or Limited, where itd also be a scary threat, capable of grinding for value by bringing itself back after being landcycled
Miraidon 28/84 Loading
(While they're phased out, they're treated as though they don't exist
On the flip side, a Standard landfall deck running Azusa, Lost But Seeking may run several playsets of modal lands on top of a higher normal land count to guarantee hitting extra land drops to enable Omnath, Locus of Creation
Will you spin Aetherflux Marvel, or are you trying to build an army of 6/12s with Stone Idol Generator