4 is about right to not be a broken source of giant creatures, some of which have really strong abilities
Enchantments: Field of Dreams is great in your recurring play groups where you know people are up to shenanigans - and they prefer to keep those shenanigans private
For one Forest and two colorless mana, the controller can cast the Legendary Creature which allows them to play two additional lands on each of their turns
I love the idea of being able to circumvent the disadvantage of Aggressive Mining or elongate Constant Mists hold on a game, but I never bought into the hype that makes Windgrace the second most popular Jund general
Sacrifice Outlets & Death Payoffs Priest of Forgotten Gods is both a mana-generating sacrifice outlet and a way to kill more of your opponents creatures, leaving them ripe for the picking
The release of these cards absolutely rocked the game and its player base, and it brought a completely new way of playing and interacting in the game