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Whenever you cast a noncreature spell with mana value 3 or greater, Y'shtola deals 2 damage to each opponent and you gain 2 life

And Shock is...well...Shock

However, if you have any cards from 1999-2003 that happen to be first editions, it might be worth checking their value

The loss of life might come from the effect of a mana ability causing you to be dealt damage (such as the last ability of Adarkar Wastes) or from the cost of a mana ability requiring you to pay life (such as the ability of Mana Confluence)

You must understand the game state to properly deduce how much you need and how much you can afford (or often have to) to risk