Counters are suddenly dead cards, suspend spells are not castable anymore, and waiting for your opponent to make a move stops being an option
The way to gain more speed is by, once per turn on the player's turn, causing their opponent to lose life, whether it's from an attack or the result of a card mechanic
If Search for Glory is copied, no snow mana was spent to cast the copy, so you won't gain any life
Of those, the top picks as highlights in Fourth Edition are of course, Killer Bees, Marsh Viper and Whirling Dervish
You can argue if you want, but many games come down to the first person to land and keep a Primeval Titan, and his effect pushes you way ahead in mana as others scramble to answer him and catch up singlehandedly