It too easily allows for access to a large portion of ones deck, without having to guess how far you need to go, and leaves the mana up for casting the cards drawn right away
As such, the second time you try to play a card, whether or not any version is actually the card, Richard's ability stops you
Then, add creatures such as Mother of Runes, Auramancer, 1/1 tokens, Nekrataal, and more friends to consideration
Hopefully, I was able to demonstrate some of the unexpected richness in this seemingly narrow school of spells from the defensive reanimation of Nim Deathmantle to the inevitable combo tool of Dread Return, the grindy engine that is Whip of Erebos to the explosive tribal finisher Patriarchs Bidding, and even some weird off-color gems like Reincarnation and Replenish
We could run the few Instant-speed Green ramp spells if we wanted to, but those tend to require Basic Lands and we don't have many of those