how to tell if mtg card is rare 15 most valuable and Magic: The Gathering cards Rarity Guide for Magic: The

In exchange for exiling your tutored cards face up, you get to effectively steal opposing tutors for yourself, and you can spend mana as thought it was mana of any color to cast your stolen cards

Royal Assassin only costs 3 to get out, and it only needs to tap to destroy a target creature

You can tell this by looking at how the prices on these variants compare to the standard versions of the card in question

Also there are many more cards like Force of Will and Gurmag Angler and the like in the constructed formats which further empowers Thoughtsieze

Fury Sliver

Its possible to have all four represented on just two cards