Black lacks good lands as outlets
There's no way that indestructible will keep a 0 toughness creature alive, it dies as a state-based effect
The trick, of course, is making sure your high-mana finishers are on top of your library when you draw them
They also have, Whenever you cast a spell with X in its mana cost, create a 0/0 green Hydra creature token, then put X +1/+1 counters on it. That means that youll be generating an extra Hydra for nearly every Hydra you cast
Not only can you get a sought-after Final Fantasy Commander deck for cheap, but youll also get some extra Play Boosters and a series of promo cards
Generally, this issue raises up by having either a plus or a minus thats way better for their cost than other options, so the choice will always be to activate that one ability as much as possible or get to it as much as possible