gandalf mtg commander deck the Grey LotR INSTANTS AND SORCERIES Magic Custom Commande HOC] Gandalf, Shadow's Foe :

His first ability lets you either tap down one of your opponent's key blockers to swing in for that critical attack, or untap one of your own blockers to surprise your opponent during their combat step

Since its an enchantment, it typically stays in play more easily than most other nonland stuff, and it gives you a powerful ability to generate the good stuff

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There is also a class of creatures that burn when we cast instant and sorcery spells

It must be here too