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Spend this mana only to cast an Assassin spell or a spell that has freerunning, or to activate an ability of an Assassin source

There are also cards like Steel Golem that make you unable to play creatures or Nine Lives which can just make you lose the game if you take too much damage

An effect like Impulse doesn't have the word draw in it, so it doesn't count for Sheoldred

These are one-time effects that WotC opts for when they want permanent cards that have more than one option

I expect that, most of the time, The Thirteenth Doctor will pick a Doctors companion with red in the color identity to unlock the various red draw into exile cards like Reckless Impulse