Mana is pretty good, but the format lacks fetchlands like Scalding Tarn and Bloodstained Mire to push it over the top
The flexible mana cost offered by her compleated ability is a great immediate benefit, letting Nissa hit the battlefield any time from turns five to seven, and her first two abilities give you very efficient ways to protect her and get rid of problematic permanents
It mimics Reckless Charge as a card all-in aggro decks will play just to push a ton of damage, even if it means card disadvantage
Cast this, make your creatures indestructible and board wipe
Arena Anthology 1 provides a host of artifacts, fleshing out our offerings with Signets, Talismans, and Swords
1st Edition copies are especially valuable, representing one of the more attainable WOTC-era Charizard grails for collectors who want genuine vintage provenance without the astronomical prices of Base Set