It looks like there might be issues rendering mana costs that have, e.g., 1GG where it does not render the second G. That is to say, it's rendered but only the barest left edge can be seen. This appears to only be the case if the card's name is sufficiently long (I noticed this with "Bethen, Cenn's Heavenly Sleep").
That being said, I have no idea how powerful Bethen, Cenn's Heavenly Sleep really is as a 4/4 flyer because it's CMC is "at least 3" because I can't see the full mana cost. The mana costs that I can see seem to suggest that the card's strength matches the mana cost pretty well, though, so I'd guess Bethen's cost was 4 or 5.
The text can sometimes say some weird things (from a 2/2 Zombie creature that costs 1 B(lack) called Null Slayer; also Zombie Human Clue is my new favorite creature type):
> (1 B(lack), Exile this card from your graveyard: Create a token that's a copy of it, except it's a black Zombie Human Clue [it's amusing to me that the reincarnated token gains the Human type] with no mana cost. Exile it at the beginning of the next end step or if it would leave the battlefield [the latter half is redundant with it being a token]. You gain life equal to the life lost this way [good to know?].)
It's still really impressive the effects it comes up with!