You might not get the absolute head-knocking power of Doran, the Siege TowerDoran, the Siege Tower, or the powerful recursion of Colfenor, the Last YewColfenor, the Last Yew, but what FangornFangorn does provide is the slow, plodding advancement of your board through mana advantage and constant attacks turn after turn
He is very strong, as for a Basic Pokmon, but you need three Energies to attack with this card
That and the land comes into play untapped, so it's essentially Rampant Growth for less mana
It can be a big deal even in blue decks, spreading out the cost of your effects between your colours (assuming you are fairly even split already) typically makes your life a lot easier
Intrepid Rabbit Intrepid Rabbit is another solid enough common that pumps something when it comes in, but it also scales nicely with the game thanks to the offspring mechanic