Nissa, Steward of Elements does something we've talked about for years but have always pushed off
Granting a scaling bonus of up to +5/+5 for 2 to cast and 2 to equip is solid, but not great by EDH standards
It slowly accumulates counters and gives you bits of card advantage at a time for a reasonable cost to discover 4
These cards are not powerful enough to be deck-defining cards in playable decks nor are they bad enough that you would never consider them
Despite how long defender has been around, there aren't a ton of cards with defender in the game compared to other mechanics of its age, largely due to the pool of defenders being kept purposefully small as, by their nature, they have much less use than other mechanics outside of Limited formats
The numbering also isnt higher than the normal sets (like Enchanted) so they are instead promo cards and not Enchanted cards