Boy am I glad I didn't dust Flark's Boomzooka. The combo potential with cards like Charged Devilsaur is pretty intense. This will also go straight into deathrattle Hunter. Since your grizzlies typically survive a turn, this card will often be a 3/12 taunt at worst. Also works really well with Oondasta.
The Zooka thing is iffy at best. It suffers from the same problem as handbuff. By the time you get the zooka in hand/have the mana, you will likely have drawn all the minions you hoped to zooka out. It will be very inconsistent. This card is better as a mid-game tempo piece, basically a full trade with cheap reload.