If it's able to reliably get a few creatures back in your deck, it can definitely be worth the mana, but often I prefer to run more reactive protection spells and reanimation that lets me pick my targets reliably
We call this the wheel, or the point in a draft where youre selecting from packs youve already seen at least once
There's no restriction on how many Class permanents you can control, whether they're the same or different classes
These decks have a lot of redundancy and if you give them an opening they can win seemingly out of nowhere
Combustion Technique Zuko, Conflicted Azula, Cunning Usurper Aang, at the Crossroads / Aang, Destined Savior Katara, the Fearless Dai Li Agents Avatar: The Last Airbender Book 3 Here's where the conflict becomes decisive
Note that size is all dorks, not just Allies