Well, the additional cost of Reanimate is paid when it resolves, before this fatty is in play. So for all those who have already jizzed in their pants - life will be lost imo :P

Anyway, it's a piece of crap. You can't hardcast FoW (which is the only way to cast it 99% of time), You can't dig further with LDV, You can't sacrifice fetchlands, You can't play another Reanimate...

Captain Hammer - Bringing Ionna on Red vs Burn ir pretty much gg in the most of cases. And the Burn isn't a hard MU for Reanimator. Can be frustrating, but it's still favorable.

Comeback - I've dropped It that Betrays from my decklist a few days ago, and I don't really miss him. He wins what is won already. Ofc, it can be gamebreaking with 43lands etc, but face it - every single creature can do it's job better than Eldrazi. It can't race with aggro like sphinx, can't lock opponent like Ionna / Archon and it's missing shroud like Empyrial and Inkwell. Terastodon can destroy something imeediately and you can target with him. In addition - reanimating him with Reanimate (not Exhume) can be fatal. 2 fetches, thoughtseize and reanimation and You can be one shoted. Geez... Don't misunderstand me, it's still great creature, but why should i want bring him on the table, when almost everytime I can meet better option?

Cheers, take care.