pokemon trading card game bulbapedia Every Original Pokémon Set Explained (1996-2000) Item card (TCG) - Bulbapedia,

For 1 mana, and at instant speed, you can search for any creature in your library and immediately put it into your graveyard, then follow with a reanimation spell

There are plenty of RG+ commanders that could make use of the cost reduction on their activated abilities, even if you never pump up Agathas power

Legions is 100% made up of creatures

There will also be two more in-universe sets before that in Tarkir: Dragontsorm and the space-themed Edge of Eternities

If the creature were to enter the battlefield without the Squad ability (say, if theres already a Humility on the battlefield), you wont make the tokens no matter if or how many times you paid the Squad cost

Prismari Artistry: Let your creativity run wild with Rootha as your artist-in-residence and cast expensive, bombastic spells