After all, players hate variance and luck in their competitive games, and so dice were relegated to a niche, casual, second plane
Forgotten Realms' Manlands Cave of the Frost Dragon Hall of Storm Giants Hive of the Eye Tyrant Den of the Bugbear Lair of the Hydra We hadn't seen a cycle of mono-colored manlands since Urza's Legacy (Faerie Conclave, Treetop Village, etc.), and the Forgotten Realms versions even enter untapped most of the time
Even when removing the huge outlier Titanium this still leaves an average difference of almost 54%, which is nearly 12 times the difference between two genuine cards
In Commander, the ability may not be powerful enough to make much of a difference, but in draft, for example, it is a reasonably good ability