Basically, if you have typal synergies, youll get the best of this mass reanimation effect
You can grind your way into a deck for free (if you have enough time to play), but if you want to just own several decks without grinding, the system for getting cards is clunky, high variance, and time-consuming, and the cost is high
The problem throughout all of this has been the pull rate. The rarity of these cards, admittedly known as ultra rares and secret rares, has meant far too often the expensive packs of 10 cards have felt like duds
This is a pretty good deal if you have items that you dont need anymore or can recur later in the game
While dependent on having an opponent play at least some number of Islands to make the most out of it, the odds are pretty good at least one of your opponents will be running blue in their deck