Reanimator strategies are most common in Legacy, where all the best reanimation effects exist
All it takes is one card that makes tokens, like Fountainport to quickly grow an army to take down your opponent in just a few turns
For completeness sake: The player cant choose an option thats illegal or impossible , with the exception that having a library with no cards in it doesnt make drawing a card an impossible action (see rule 120.3)
Youll often see cards like Edric, Spymaster of Trest in these decks too, helping small evasive creatures keep your hand full
This is the sort of potential Commander that can lead to knocking a player out with Commander damage without a whole lot of difficulty
You get a murderers row of reprints, including Korvold, Fae-Cursed King, The Gitrog Monster, Oracle of Mul Daya, Omnath, Locus of Rage, and Soul of Windgrace