Mana curve is the most important aspect of deck building
I think most importantly - and most excitingly - you can make a truly enormous Army with this card
10 Goldbug, Humanity's Ally // Goldbug, Scrappy Scout Goldbug, Humanity's Ally does a great job at protecting Human creatures, preventing all combat damage done to them while theyre attacking, allowing you to safely swing all out with an army of humans
This and Dusk Rose Reliquary get better
Five mana buys you a lot when youre casting this planeswalker, but pressure is the most important aspect of Nissa because she allows you to literally hurl 5/5s at your opponent or their planeswalkers like Donkey Kong chucking barrels
Cards that reset your opponent's entire board state while leaving your own intact are few and far between, so the power of this card should not be underestimated, even though it doesn't technically destroy anything