I'm hugely impressed by this card and can see it getting some play in Limited and Standard, but maybe not so much in Commander unless part of a Hero tribal deck
For creatures, that is
A possible leaves trigger, three possible enters triggers, three possible death/leaves triggers from the tokens, another possible enters trigger if Siegebreaker dies or leaves the field and your exiled creature comes back, and it can be combined into blink combos and burn combos by itself
The lands we play with her should get exiled if they go back to the graveyard, but we can respond to the exile trigger, bring the lands back with some of our instant-speed recursion, and we won't have to exile them
Well, its only a matter of time until we get an elephant precon
So much, in fact, that I brewed a deck around him on one of my deckbuilding streams