Useful as disruption, as a sac outlet, as a thing you can tutor into your bin, as a way to get stuff from your hand into the bin
Starting a few years ago, WOTC decided to replace traditional 60-card precons with Commander precons because it had become the most popular format among players
Brought Back feels especially gross for opponents, and thats just the tip of the iceberg on ways you can increase Solitudes power
Our creatures start off as 4/4's and 5/5's (Lambholt Elder) and only get bigger thanks to our lords (Mayor of Avabruck), which put them in a prime position to start mauling opposing creatures
Ramp : Ramp decks want to build enough mana to cast powerful cards that are too much for opponents to deal with
Giving all your dragons indestructible means you can swing and block without fear, and the bonus of stacking +1/+1 counters every upkeep quickly snowballs, all on top of a potential alternate win condition