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Monastery Mentor Monastery Mentor, one of the best prowess cards in Magic, has been a great card in many formats all the way up to Vintage, where the sequence of casting it as fast as possible using fast mana and following up with free spells like Mox Sapphire and Gitaxian Probe makes Mentor one of the biggest threats in the format

Detention Sphere is Maelstrom Pulse meeting Oblivion Ring and gets the job done

We would hesitate to call them free but it leaves their value somewhat ambiguous

There have been many times where I will just play this for 2 black mana, making X = 0, just so it is on the battlefield

Its an investment of both time and money, so you want to be sure its the right move for your collection