I'm looking at you, Solphim, Mayhem DominusSolphim, Mayhem Dominus and Torbran, Thane of Red FellTorbran, Thane of Red Fell
Whenever a nontoken creature you control enters, if you didn't cast it from your hand, it gains haste until your next turn
The catch is that you have to draw the token, and you only have 15 seconds to do so
The Nazgl have more value in Commander
These are usually used in the trading card game
If your deck is trying to cast as many X spells as possible every turn, and wants X to be as much as possible, we probably want to prioritize ramp more highly than just 8 or 10 spells - in fact, I can see running 60 mana sources, like this Vaevictis Asmadi, the Dire deck