The Terapagos ex card shown above, for example, needs 1 Grass, 1 Water and 1 Lightning Energy for its Crown Opal attack, which deals 180 HP damage and also (heres the best part!) prevents all damage done to Terapagos ex by attacks from Basic, non-Colorless Pokemon
Similarly, card types like planeswalkers are necessarily found across all colors
Fallen of Albaz lets the player fusion summon using the opponent's monsters as tribute, making it by far one of the most annoying cards in the game
A free LVL7 with great DEF is nothing to scoff at
Now consider that Visions put phasing in close proximity with some of the all-time-best ETB triggers, and that the average players understanding of the rules (and to be fair, the rules themselves) were much more loose than in our present era
This can lead to some serious draw with the right treasure token producing strategy