It's 84 resilience.
It costs 25 WG marks.
If you have 25 WG marks to spend, and you want 84 resilience, then of course you should buy it, and ignore what the people here are saying. They're your marks. You can spend them on whatever you want. You're not rolling against anyone else.
Also, people seem to be thinking the DM card is 105 resilience and 105 crit, when in fact it is not. It has a 50% chance to proc. 35 resilience and 35 crit each time it procs, stacking 3 times.
What this means is it will take an average of two hits for it to proc. Here's what it looks like on average, when you get hit:
DMC: Berserker!
1 hits: 0 points worth of resilience
2 hits: 35 points worth of resilience
3 hits: 35 points worth of resilience
4 hits: 70 points worth of resilience
5 hits: 70 points worth of resilience
6 hits: 105 points worth of resilience
Anvil
1 hits: 84 points worth of resilience
2 hits: 84 points worth of resilience
3 hits: 84 points worth of resilience
4 hits: 84 points worth of resilience
5 hits: 84 points worth of resilience
6 hits: 84 points worth of resilience
...and so on. Assuming resilience is linear, and even if it's not, you would need to be hit around 15 times on average for the DMC to have blocked as much damage as the Anvil. That's obviously not taking into account the crit buff. Also, as said before, the DMC costs money. The Anvil is free. 25 marks are absolutely nothing.