Trying to find a mechanic in gaming /tg/, and before I result to homebrew, I thought I'd ask you.

Rock/paper/scissors mechanic; you attack me with a power attack, if I try to parry, I'll get owned. But if I dodge, it'd end up better

This continues on to elemental magic; you throw a fire bolt, I'd block it with an ice shield instead of a wooden wall.

Any ideas guys