Of course, it is a Sorcery, and you dont often have time to use up all your mana on a turn and not add to the board at all, so that really balances things
Freeze the characters your opponent was about to win with and buy yourself some time to banish them
There are a ton of ways to maximize the mana generation of this card (cough elves), and the massive mana income you get from Gaeas Cradle can be used to fuel your swarm or to bring out big spells or giant monsters that green loves so much
For starters, I love creatures with variable power and toughness, especially when there's an X in the mana cost
"Hideaway N" means "When this permanent enters the battlefield, look at the top N cards of your library
Rarity: Limited edition releases or cards from special sets are generally more valuable