If you have one or more creatures and one of them is killed in response to the bolster trigger, another creature gets the +1/+1 counters
Friends on the Other Side will draw you four cards, Let the Storm Rage On will deal four damage and draw two cards, The Bear Necessities will force your opponent to discard two cards: the possibilities are endless
This, essentially turns your enchantments into cantrips
If you look up the price, all you have is what someone is willing to sell the card at and that can fluctuate dramatically
At first glance, this doesnt seem like a very efficient use of your land cards, but when you consider lands with enter-the-battlefield effects, as well as the ample land recursion options available , things get a lot more interesting
There are two tiers of mastery, one with the pass and one without