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As Voltorb's attack causes it to sustain ten damage, you are in trouble if you cannot heal it first

Not only does this give you a massive boost of Energy presence on the field, but you get back all the cards that left your hand with the three cards drawn

You can take the loss and overcome the card consumption, but the probability of success will not be that high, and if you only see Will encounters and organize consumable cards corresponding to the Will icon, there will not be enough space to put other cards

Oh, and it's completely free

Pashalik Mons similarly gives you guaranteed damage in the face of board wipes and can effectively set everyones life total much lower since board wipes significantly hurt them