A flip card can only be your commander if its front side is legendary, so a Nezumi Graverobber that flips into the legendary rogue Nighteyes the Desecrator cant be your commander
Aetherworks Marvel defined its Standard format when it was used to put in play one of the best of the Eldrazi titans, Ulamog, the Ceaseless Hunger, ahead of time, effectively ending the game on the spot, but its a bit more of a roulette wheel in Commander
Offspring is also an additional cost, so if you can cast a creature for free, youd still have to pay 2 mana to get the token
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Florian, Voldaren Scion [Best Vampire Commander for Aggro Card Advantage] If were talking about the best Vampire Commanders MTG has for aggressive value engines, Florian is right up there swing hard, deal damage, and he pays you back by filtering through your deck post-combat