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What affects the value of Balduvian Rage

Amass on slivers is just awesome, and it gives you another creature type to add to your armies

Spellbook decks are all about compiling free advantage through Spellbook Magician of Prophecy, The Grand Spellbook Tower, and Justice of Prophecy, using Spellbook of Fate to interrupt and survive any of your opponents attempts to wrestle control of the duel, and then normally you lean upon a High Priestess of Prophecy to seal the duel

This artifact equips creatures with Haste much like the Sonic the Hedgehog card, but also grants Shroud, meaning it would still be useful for Sonic to equip