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There's no restriction on how many Class permanents you can control, whether they're the same or different classes

If Crystalline Resonance copies a permanent that's copying something else, it will become whatever the target is copying

This creature truly does grow your creatures at an exponential rate and anyone who knows a thing or two about exponential growth knows that it can get out of control really fast

Secondly, in decks with a way to sacrifice a lot of cards for value before bringing them back for another go around

Boros already has this sort of effect attached to a legendary creature you can run in the command zone with Zirda, the Dawnwaker, but its nice to get another one in Gruul with Agatha of the Vile Cauldron