Commander Mustard has a passive ability, giving your other Soldiers an impressive array of keywords, vigilance, trample, and haste, turning them all into threats
That said, Rampaging Ferocidon is now just another three-drop in a sea of good red three-drops, and you could just as easily end up wanting Goblin Rabblemaster, Goblin Chainwhirler, or no three-drops at all depending on how you build your red decks
Either way, this will be a good way to slow down the opponents board while also adding to your own, even if the creature cant immediately get in there for damage
For new players, this certainly looks exactly like drawing cards, but you're not drawing cards unless the effect literally says draw. Narset, Parter of Veils is a good example of this difference
For punctual removal, we have Infernal Grasp, and in case you are the target of a massive attack, Aetherize will solve your problems