Simply be careful, because your opponent can also see it coming
But the rare card also has a single ability called 10,000 Needles, which is excessive in a way that only Final Fantasy abilities can be excessive: Whenever this creature attacks, it gets +9999/+0 until end of turn. Do you need to deal 10,000 damage to another creature in a game of Magic ever
Mana Geyser, Treasure makers, and so on can power out monstrous dragons, Eldrazi, an Ugin or two one of the best ways to use excessive ramp is to draw a ton of cards, either to convert that ramp into card advantage, or to ensure you have a bunch of ways to use your temporary mana
While a 1/1 might not be much to write home about, as soon as you get ten permanents in play and you get the City's Blessing, all your Saproling creatures get +2/+2 and suddenly become 3/3 threats
You only gain control of the creature if it actually regenerates
Couple this with his Bodyguard and your opponent will find difficulty taking him out early without some form of removal or some specific cards such as Maui - Hero to All (Enchanted)