Scan multiple cards in a row to catalog your collection quickly
Ajani, Valiant Protector falls into the latter category
The only other set to see constellation return as a major mechanic was Theros Beyond Death which returned to Theros as its primary setting
It's a fantastic card that severely ramps up Treasure production, and allows you to get two mana out of them instead of just one
It can declare rulings on any in-game circumstance, issue errata, change card text after publishing, and change the basic game rules, although the latter three rarely occur
Positive loyalty taps a creature, negative loyalty draws cards based on the number of tapped creatures an opponent controls (hello, mass tappers), and the emblem turns your maximum hand size infinite and (optionally) returns anything that hits your graveyard to your hand