If your deck's key engine is a 4cmc commander like Kaalia of the Vast, for example, then you will want to run ramp cards that can get her out faster, which means ramp that is between 0-2cmc so you can cast Kaalia on turn 3 or earlier instead of her usual turn 4
The classic example is a blue player deliberately setting aside (or holding up) two untapped Islands from the rest of their mana and then passing turn: they are now representing Counterspell
In order to use this great tool, it is helpful to understand what keywords are and what they add to a game
In the 10th, where the link was summoned, the importance was pushed because of the transcendental versatility of the Christon-Hari Fiber.[5] Hari Fiber was eventually banned, and since then, he has been reborn as the best part of the 12th support and a right to give a right
Maybe they are, but they shouldn't be
:( UPDATE: Added 5 cards-Fizz and Chum, Taric, Zephyr, and Zhonya's Hourglass