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He didn't need to do so, but he did it because he cares

It essentially makes one-mana mana dorks free since they can tap for mana right away, which could give it potential in GB Elves where it could allow the deck to combo off with Leaf-Crowned Visionary while also untapping Elvish Archdruid and getting back important combo pieces like Heritage Druid from the graveyard

Plus, if you possess the extra energy in your hand, it shuffles your discard stack into your deck

Magnus the Red is one of the few Primarchs still around, and as the Demon Prince of Tzeentch, he leads his Thousand Sons Traitor Legion to victory against the Imperium