theros beyond death - booster box new gods MTG Booster Pack Theme :

Some of these cards are around, but this one in particular is unique for a couple of reasons

Once a pack tactics ability triggers, it doesn't matter what happens to the attacking creatures

This little relic of the past is also the only card that's ever explicitly referenced 'mana burn' in rules text

Its a punishing, kill-the-spiky-monster-with-gobs-of-health scenario if played straight, and even with my Calvin doing reliable damage I didnt see any way that I would be able to defeat Umordhoth without dying

In theory, the playability of both of these cards could make the new Source Material variants more expensive than normal