The Amber and Amethyst deck is probably the easiest to master, while the Ruby and Emerald deck is the trickiest of the three to understand, although its probably the most flexible and adaptable of the three decks
Not only is this a limitless, instant speed, zero extra cost sac outlet (top marks on those three major categories) but it is also a relevant tool in its own right
As a final note be a little careful about when you choose to cast Enduring Renewal
Pulling Infinite Guideline Station or Sothera, the Supervoid really underlines how different this set feels
Julius Jumblemorph Genemorph Imago Ghyrson Starn, Kelermorph Greater Morphling Hulking Metamorph Hydromorph Guardian Hydromorph Gull Ichthyomorphosis Jalira, Master Polymorphist Majestic Metamorphosis Manamorphose Mass Polymorph Metamorphic Alteration Metamorphic Blast Metamorphic Wurm Metamorphose Metamorphosis Metamorphosis Fanatic Mordenkainen's Polymorph Morphic Pool Morphic Tide Morphling Nascent Metamorph Obscura Polymorphist Phyrexian Metamorph Polymorph Polymorphist's Jest Polymorphous Rush Reptil, Dinomorpher Spellmorph Raise Dead (playtest) Terramorph Terramorphic Expanse True Polymorph
It is value but in a less useful form than card draw
