Casting a Mulldrifter for 7 mana via the offspring mechanic means that you get an extra 1/1 and two cards, as a tame example
The slot for the large token box will hold over 60 double-sleeved cards, acting as a land station for smaller cubes
Special variants like serialized cards, old Reserved List prints, and limited promotional cards can be even rarer due to extremely low print runs.
As floods and screws are the extreme ranges of Magic the range on level up best comes in to play
Since the creature has to attack each turn, it isn't a great answer to opposing commanders, like an Imprisoned in the Moon is, but you disrupt decks that rely on a key card or two when you keep a threat out of your enemys hands
Most aggressive decks fold to a well-timed board wipe, but Exemplar ensures your army stays put