Finding ones in great condition is the difficult part and these will still set you back a pretty penny
Tribal Reanimator Commanders (Scion of the Ur-Dragon, Horde of Notions, Gisa and Geralf, Kaalia of the Vast, etc.) There are a LOT of commanders well suited to tribal reanimator strategies, but the 4 I have listed here exemplify what you should be looking for when narrowing down which legendary creature should be at the helm
During controllers upkeep, new heads may be grown for three red Mana apiece. Back then games would last longer, so the ability to regrow heads played into the strategy around this card
On that front, the team took an effect that started with a blue card from Seekers of Kamigawa, a 2005 set, and turned it into a red card effect creature in Casey Jones, Vigilante
Just paying 2 mana to escape from a wrath effect looks like a steal