Nobody is going to want to drop an Ulamog, the Ceaseless Hunger down and leave it sitting out for your next turn
And annihilator is usually better than menace
Firstly, as this Ajani's +1 ability prevents target permanent from untapping during its controller's next untap step, you can easily deprive an opponent access to one of the lands they'd used during their last turn
Our EDH League hasn't been playing for weeks, but I'm working hard to get our guys back into playing Commander even if we're doing it online and not bothering to track league points
The key feature of Tinybones, Bauble Burglar is that it's a cheap commander, meaning you can get it out early and then start the engine going when your opponents discard cards
Discard effects won't win you the game, generally, but if you can keep your opponents from keeping anything worthwhile in hand, it makes your creature strategy easier