mtg draw a card then discard a card

mtg draw a card then discard a card quick one, when I trigger Magecraft and I cant do I still card? Thirst for Discovery · Innistrad:

Name: mtg draw a card then discard a card quick one, when I trigger Magecraft and I cant do I still card? Thirst for Discovery · Innistrad:
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Pyxis of Pandemonium Um

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It has a ceiling when it comes to stealing and keeping the exchanged creature (how much energy you have), but it can just outright remove a creature for two mana if you choose to/cant pay the energy requirement