Consider the fact that the magneto deluxe pack gives you an instant 6* villain capable of getting 100k ABX on his day easily. That broadens your roster that you’re working on and gives you more growth potential via the ABX rewards. Since his ABX day is also during weekly reset, he can be used 2x per 2 weeks for the 100k reward. Add to that the 20 daily bios for feeding to native T2 characters and the extra mkraan shards, crystals and Phoenix feathers, and it’s not so easy to say “I’ll get him later”.
If you delay getting him for ... 6 months, you’re effectively losing ~360 free bios, a lot of crystals. And if you don’t have an alternative for blast Villain ABX during that time, you’re missing 26 ABX rewards.