I mean do you want to get a big minion or a small minion?
Well you can do x2 embiggen and then play southsea deckhand or bloodsail corsair. 5/5 patches comes out of your deck. If you do a ridiculous highroll and have two parachute brigands in your opening hand, you can have a 1/2, 2/2, 2/2, 5/5 on turn. 10/11 or 11/10 in stats. Druid has access to germination though it doesn’t pair well in aggro decks. Big druid isn’t popular in wild.
If you want a big minion you can try big shaman. Turn 1 you can use lightning bloom + coin or two lightning blooms to play ancestors call. Best case scenario you get a turn 1 colossus of the moon. Shaman has cards such as reincarnate and ancestral spirit to resummon it.
There’s also cube lock. On turn 3 or 4 depending on if you have a coin you can play voidcaller. Sacrificial pact on that guy can send out a malganis, voidlord, or enhanced dread lord. You can copy it on the next turn with faceless manipulator or destroy the big demon with carnivorous cube and then killing the cube in some other manner. You can be extra greedy by using manipulator on the cube too.