Try it out, I think you'll be surprised by how good it is
Since this ability triggers when your creatures die in any way, you can sacrifice your creatures to any sac outlet you may have, which in an aristocrats deck should be plenty
Ferrothorn can be obtained from Fantastical Parade pack in the Fantastical Parade set
Just remember, those who don't believe in magic will never find it
Creatures (27) 2 Kird Ape 1 Keldon Marauders 4 Wild Nacatl 4 Goblin Guide 4 Burning-Tree Emissary 4 Experiment One 4 Reckless Bushwhacker 4 Hidden Herbalists Lands (20) Spells (13) Im not sure Keldon Marauders is going to prove high-impact enough, but the theory is that combining it with Reckless Charge is especially effective (since normally it only gets one hit in)
Having a consistent way to not only create a second combat phase but also untap all the creatures you control for a measly four mana is a phenomenal pairing, especially when used as a Commander to bring her back into the fight after being targetted