There are few things as satisfying about having a homegrown combo pop off and then decimating an opponent with one hundred 20/20 thopter tokens with haste in a single turn, or whatever your nonsense of choice is

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In all my years of collecting, I don't think I've ever opened up over 1,000 packs, which should put those odds into perspective
The next question to ask ourselves is: How many untapped red sources are needed if we want to be able to cast a one-drop 90% or more of the time in our keepable hands that also contain a one-drop? The answer is eleven untapped red sources (91.2%)
Aside from that, the cards from the 99 that are more standalone cards are potent, too
On the high end, Ezuri could just spam Sprout Swarm and create a 10/10 Blighted Agent, and Meren just needs an Altar of Dementia and Avenger of Zendikar to acquire enough experience counters to reanimate any creature going forward