It cant be regenerated this turn
Spell Snare struggles to compete with more reliable counterspells that do not have their power level determined solely by what the opponent is playing
It shows how little the designers understood the game they had created that this card - which lets you draw three cards for one mana - was assumed to be roughly as powerful as Giant Growth, Lightning Bolt, Dark Ritual, or (of all things) Healing Salve
Forgotten Cellar's ability won't stop tokens from going to your graveyard as normal (and ceasing to exist shortly thereafter, also as normal)
Not only does he give you an extra shot at a good roll each time, which greatly helps the consistency of such strategies, but he also grows in size each time you do roll, serving as a support card and a payoff all in one
Generating card advantage and quickly ramping into huge threats is the order of the day here, and that plan starts with Growth Spiral