Just thinking of interactions, even if they are bad.
Mage getting one of these off a Conj (if they are somehow using it on an 8 drop). Drawing 8 cards with a deck that typically has very large hands. Curio Collector can get a massive +8/+8 if you can draw all 8.
Rogue could get this card as a discover with Myra Rotspring. This would allow Rogue to draw 8 cards on turn 4 with Myra Rotspring+ coin + backstab. Looks like a really bad play, and you would be stuck with another Octosari in hand, which would total 16 cards. I guess Rogue is one of the classes that is built to draw the most...
Anything that shuffles cards into deck, like the Portal Demons, Shadow Clones, or Wonder Scrolls, 8 cards is good odds for even 2 hits on these cards. When your hand gets full you can burn bombs & corrupted blood.
Could be a good card for just burning through deck, a single card eating away at what would be almost half the remaining deck by the time the deathrattle was triggered.
If Octosari is on the board when you Deathwing you get hand refill.