Mystic Sanctuary comes into play tapped unless you control three or more other Islands, which can be kind of steep but comes with a strong ability in return
This is the quintessential "slippery slope" where one seemingly reasonable argument opens the door for another, and another, and the next thing you know we might as well just be playing with 20 life, 10 infect, and no "special treatment" card list
Its less deep than Magic, but the gameplay is solid, and the core mechanics provide a lot of opportunity for future card designs
Depending on build, that payoff can be combat-focused (for example Craterhoof Behemoth/Finale of Devastation) or spell-chain focused.
Steel characters, such as Anna True-Hearted, keep your quests safe with high resilience, while items like Imperial Bow give a significant combat advantage, granting keywords like Challenger and Evasive to tip fights in your favor