Inho, the deck lacks focus...making it a trio isnt probably the strongest choice...
If you want to make it stronger, you should probably try to make it a duo deck:
either might go for more poison, more emphasizing the poison aspect and skip toad fishs
-> e.g. change mark to death, add poison (card), 1-2 arsenic if you have them.
or you skip the poison idea and strengthen the air aspect...but for this ive got no good idea atm.
in any case the deck lacks some defense, as this deck is not really a fast killer...i would probably add 1-3 purifies (SoGs would be better, but i assume you dont have any...)...1 or 2 arctic squids could also be useful, but as these are rare, too,....
just my 2 cents...