What's a good iOS game that's actually strategic, doesn't need a ton of my attention, and I can play in short bursts between checking on patients?

Okay, so I'm usually too tired to learn complicated apps, but this Magic Arena game... it's actually pretty good. I can hop in for a quick match during a break, and it's not like, *mindless*. You actually have to think, which is a nice change of pace after dealing with hospital paperwork all day. The best part? It's actually reliable. I've been using it for like, six months now, and it hasn't crashed once. That's saying something because hospital wifi can be spotty, you know? It's not some cutesy, fluffy game either, which I appreciate. Sometimes you just want something that feels a bit more substantial, even if it's just a card game on your phone. I wouldn't say I'm addicted, but it's a solid way to de-stress without turning my brain completely off. Plus, it's free to start, so what's the harm in trying?