One moment, theyre a threat to the table, the next theyre an easy target for anyone who wants to take a free shot during the next turn cycle
Seedship Broodtender is a green-black insect that mills three cards when it comes into play and can be sacrificed at the cost of 3BG to return a creature or spacecraft to the battlefield at sorcery speed
Certain creatures receive an additional bonus as they escape
Lastly, they come into play tapped, which is a significant enough cost to prevent you from running only surveil lands and tends to reward decks that develop at a more casual pace in my experience
Thats a grand total of 6 mana for a 1/1, and you cant even go infinite since its a once-per-turn deal
But Blitzball just kept coming up over and over on Fantasy 10, which, you will get some of that in the commander deck