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Finally, Im excluding black creatures whose relevance is tied to non-Commander formats
As a rule, creatures you choose to sacrifice can never be saved from dying regardless of what effects or abilities they have at best you can immediately bring them back to life afterwards
The Starter Kits are super fun to sleeve and use for quick casual games, and I rate the two you get here
Gothmog, Morgul Lieutenant Gothmog, Morgul Lieutenant has a similar issue as Gwaihir
However, the Colossus has indestructible meaning it cannot die from lethal damage