Building your deck around mechanics like treasure, cascade, or looting unlocks lines of play which are so good, theyre almost unfair
It can remove finality counters, -1/-1 counters, and any other type of counter
You can fairly reliably cast Gweena on turn two in other formats like Pioneer or Explorer, with one mana creatures like Llanowar Elves and Elvish Mystic to help ramp up to bigger cards like Craterhoof Behemoth
It has just crossed the line and reprinting it would have serious economic costs attached that would be hard to stomach
Having control over how your early game develops means you're more likely to survive until the mid-to-late game where the deck starts to shine
Their Number Is LegionTheir Number Is Legion costs a lot for what it does, but it's at least a welcome sight when you need that late game spell to push you over the top